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1.
Something you do that turns people off from whatever they may be eying or interested in, thereby making them suddenly repulsed from that interest.
Jess: Can I have your crutons?
Jo: *dumps the ranch on her salad*
Jess: Never mind.

Jim: *looks at girl from behind* Hey she looks hot!
Larry: Watch her be a butterface.
*girl turns around, and is indeed a butterface*
Jim: Uggggh you just had to dump the ranch on it, didn't you?
by HexMaster June 27, 2008