G: The exact first time anyone ever yelled it in a theater isn’t something I can prove from public records (callbacks spread orally and mutate), but I can bracket how old it is based on when it shows up in written/online callback collections.

What I can verify

The specific gag “Let’s use the Triple Action F----- Magnet! …with optional leg lift!” is recorded on Rocky Horror Wiki’s callback list. citeturn9search2
Cosmo’s Factory (one of the big early callback/script aggregation sites) was already being built in December 1994 and went online December 10, 1994 per the official Rocky Horror fan site’s profile/timeline. citeturn11search3turn11search5
Cosmo’s Factory’s published scripts include the same “magnet” bit in that Dr. Scott / Zen Room moment (wording varies by version/cast: “triple-power…”, “triple-contact…”, “triple action…”, etc.). citeturn9search7turn9search3

Practical age estimate (best-supported)

At minimum: the line (or a very close variant) is older than your 1997 memory—it’s clearly part of the well-established “Zen Room / magnet” callback cluster that was already being compiled by the mid-1990s online. citeturn11search3turn11search5turn9search7turn9search2
Most likely: it’s 1980s–early 1990s in live-cast circulation, then documented online by the mid-1990s, and you heard it on a recorded AP track by the late ’90s because it was already “standard enough” to get captured.

Third option I considered

It’s possible your 1997 recording had a nearby cousin line (e.g., “triple-contact…” / “triple-power…”) and your memory later “normalized” it into “triple action,” because that spot has a bunch of interchangeable variants across regions and scripts. citeturn9search3turn9search7turn9search2

日本語（にほんご）: これは 1997年（ねん）よりまえからあるコールバックだと思（おも）う — I think this callback existed before 1997.

G: [Non-text content: thoughts; content_type=thoughts]

G: [Non-text content: reasoning_recap; content_type=reasoning_recap]

G: Yeah — I think I know exactly what you mean, and I can also point to the most likely “somewhat official” CD release family.

The CD you’re probably talking about

“The Rocky Horror Picture Show – Audience Par-Tic-I-Pation (Audience Participation Album)” (often also branded/marketed with “Say It!” somewhere on the packaging) is the semi-official audio release that’s basically the movie audio with an audience/shadowcast and callbacks mixed in, released originally as a double LP in 1983 and later reissued on CD. citeturn0search18turn0search2turn0search9

Why it matches your description:

It’s explicitly an audience participation recording (not just the music soundtrack).
It’s a commercial release that circulated widely enough for people to have it in the 90s.
It’s a known “source of lines” for a lot of early standardized callbacks. citeturn0search18turn0search9

Pre-1998 versions that fit your timeframe

From the Rocky Horror official fan site discography:

1983 (USA): Audience Participation Album (double LP) citeturn0search2
1994 (USA): CD re-issue of the 1983 album (Rhino/Ode) citeturn0search2turn0search21
1997 (USA): “The Rocky Horror Collection” box set that includes the Audience Participation Album as one of the discs (so you could’ve had it that way too). citeturn0search2turn0search25

So if you had a “legit-looking” CD with movie audio + callbacks in 1997, it was very plausibly either:

the 1994 CD reissue of the Audience Participation Album, or
the 1997 Rocky Horror Collection box set that included it. citeturn0search2turn0search21turn0search25

What I can’t do from public info

I can’t confidently identify your exact disc without at least one of:

cover art description (lips vs. cast photo vs. “Say It!” branding),
how many discs (1 vs 2 vs box set),
any track names you remember,
or label info (Ode/Rhino/Castle/etc.).

日本語（にほんご）: たぶんそれは「Audience Participation Album」の CD だ — It was probably the “Audience Participation Album” CD.

G: Yes — that memory lines up very cleanly.

What you’re remembering is almost certainly the CD reissue of the 1983 Audience Participation Album, the one that opens with Sal Piro’s spoken introduction explaining callbacks and participation as if the listener has never been to a show. That detail is the clincher.

The release you had

entity["album","The Rocky Horror Picture Show – Audience Participation Album","1983 live recording"]

Originally recorded: 1981–1982 at the entity["point_of_interest","8th Street Playhouse","New York City, NY, US"]
First released: 1983 (double LP)
CD reissues: early–mid 1990s (notably 1994), widely sold and circulated in the exact period you were in high school
Content:
- Movie audio
- Full audience callbacks
- Sal Piro’s intro, explicitly framing this as “how Rocky Horror works” for newcomers

That’s why it felt “somewhat official” and instructional rather than just a bootleg AP tape. It was designed to teach participation to people who had never been to a screening.

Why this matches your experience exactly

You hadn’t been to a show yet → Sal Piro explaining callbacks makes sense.
You heard standardized callbacks (like the magnet line) → this album is one of the primary vectors that normalized them nationally.
Pre-1998 → the 1994 CD reissue was everywhere in the mid-90s.

If you learned callbacks before seeing Rocky in a theater, odds are very high you learned them from this album.

image_group{"query":["Rocky Horror Audience Participation Album CD cover","Rocky Horror Say It album cover"]}

日本語（にほんご）: それは 90年代（ねんだい）に再発売（さいはつばい）された CD だ — It was a CD reissue from the 1990s.