Top Definition
A guy into the following: his fraternity, spring break, Dave Matthews, sports bars, chain restaurants, Abercrombie and Fitch, thinly-veiled misogyny. From the character "Chachi" of "Happy Days" and "Joanie Loves Chachi" fame. Oddly, Chachi himself did not fit the above criteria; yet, he embodied the essence of trying way too hard and having no fucking clue.
At my cousin's bachelorette party, we ended up at Senor Frog's - full of chaches. I had to bail.
by that girl April 30, 2004

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