There was a period in the early 90s that the term "cha-ching" was used quite often and fondly. We owe this to a young Seth Green, who, in the state of pure elation at being a drive-thru cashier at a competing fast-food chain to the honorable Rally's, couldn't help but shout the term repeatedly, propelling it into the everyday lexicon of cool kids everywhere (actually, just the U.S., and maybe only in the Midwest). Now if we ever heard the word coming out of a mouth of an actual human being, it'd make us squeamish. See how this works? Outdated slang is mad embarrassing.
No cultural order has had a quicker turnover rate of vernacular than hip-hop though. The team at online magazine Passion of the Weiss has done the Lord's Work, digging through a graveyard of moth-eaten slanguage to list—to honor— the most obsolete of the bunch, complete with visual aids, personal reflections and insight into the words' origins and meaning. Buster, phat, jiggy, flossy, chickenhead (seriously?), skeezer... they're all in there, though I'll forever be partial to the mighty profound "no diggity."
Follow Lauren Beck on Twitter @heylaurenbeck.