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When you see a chick with a nice ass you do smacking motion and you say "wapoosh". That simulates the sound of the hand smacking the ass.

My buddies and I at work patented this one. It's really a sound we make but when we type it out on instant messenger we type it as Wapoosh.
Damn, look at that ass dude...(smacking motion)Wapoosh!!!
by Zardoz October 30, 2004