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1.
From Chuck Lorre Vanity Card #130
The uncomfortable feeling straight men have when they're watching porn and are momentarily turned on by the wrong ass.
Bert was so homortified by the skin flick he was forced to use his imagination.
by H.T.J April 07, 2005
 
2.
When guys are watching porn and suddenly are aroused by the wrong ass.
Two guys watching porn:

*Guy appears on screen*

Guy 1: *boing* I've just been homortified!
by Somebody February 12, 2005