I was sent an old clip of Saturday Night Live (SNL). The clip happened to contain a “Wayne’s World”-esque “NOT!” (e.g., “That sounds like fun—NOT!” for “That does not sound like fun”), but it’s thirteen years earlier.

I learned the post-clause NOT! expression from the “Wayne’s World” segments on SNL in early 1990. The sketches began at the beginning of the fifteenth season in Fall 1989, but I don’t think the post-clause NOT! appeared until the Tom Hanks-hosted February 17, 1990, episode (Season 15, Episode 13, video clip embedded below).

Tom Hanks plays Garth’s (Dana Carvey) cousin Barry, a roadie for Aerosmith. Barry has brought Aerosmith to appear on Wayne’s World, Wayne (Mike Myers) and Garth’s community-access cable show. After Barry demonstrates his roadie duties, comes:

WAYNE: Anyways, Barry, uh, that was really interesting. [mugging to camera] NOT!

(Waynes [sic] World with Aerosmith, 04:39-04:43)

With the movie Wayne’s World in 1992, the expression became even more popular. It even made the American Dialect Society’s 1992 Word of the Year. According to Sheidlower and Lighter (1993), however, the usage of post-clause NOT! is older than that:

The publicists for the movie Wayne’s World claim the construction was coined in the late 1970s by Steve Martin and Gilda Radner in “The Nerds,” an ongoing sketch on Saturday Night Live:

That’s a fabulous science fair project. . . . Not!

(Jesse T. Sheidlower and Jonathan E. Lighter (1993). A Recent Coinage (Not!). American Speech, 68(2) (Summer, 1993), 213-218 [first page].)

For the SNL quote, Sheidlower and Lighter cite a 1992 “On Language” column by William Safire. Safire calls it “belated negation” and gives the sketch as 1978.

(William Safire (1992). On Language; Not! New York Times Magazine. March 8, 1992, 20.)

That would be the April 22, 1978, episode (Season 3, Episode 18), with Steve Martin as host. That sketch doesn’t seem to be on Hulu. At any rate, at least my discovery is still a little older. The usage I stumbled on is from two years earlier.

In the very first season of SNL, the May 8, 1976, episode (Season 1, Episode 19) has Madeline Kahn as host. The show has a slumber party sketch about what a group of young girls think sex is:

MADELINE KAHN: That is why you should only do it after you are married. Because then you won’t be so embarrassed in front of your husband because you will [would?] be in the same family.

LARAINE NEWMAN (sarcastically, with only a slight pause): Oh, well. Now I really want to get married. Not!

(Slumber Party, 02:46-03:00.)

I can’t get too excited about this either, however. It turns out, according to Mark Israel (Postfix “not”), the construction is a lot older and goes back at least to 1905 with Ellis Parker Butler’s Irish English poem Pigs is Pigs (“. . . ‘Cert’nly, me dear frind Flannery. Delighted!’ Not!”).

Part 2:
Buffy (and SNL) ‘much’ much?: Slang research with Hulu.com, Part 2

See also:
Gateway to Corpus Linguistics

Corpus.byu.edu (English, Spanish, and Portuguese online corpora)