The file
Amy Heckerling built Clueless out of real Beverly Hills teen slang, and as if was the line that traveled. Two words, a hand up, and the argument was over.
Younger Gen X said it in high school; older Gen X said it about younger Gen X. It's now the one line everyone quotes from the movie.
Sources: Wiktionary — As if! · Wikipedia — Clueless (film)