Top Definition
Quaaan is a word used when somebody is shocked, it is used in a highly negative way often by people disliked by many.

Note the silent 'n' on the end.

You say it like this: Kwaaaaaaaa!!!
Jimmy Red: I bumped into your girlfriend the other day.
Wonderboi: Quaaaaaan
by NeccessaryEvil June 30, 2010
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