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2.
The act of having a nervous attack over a small event; freaking out to the point where everyone thinks you're a pansy.
When he saw the spider in his room, he totally vagged out and asked his girlfriend to kill it.

Dude, she totally didn't mean to defriend you on Myspace; quit vagging out.
by Quiet Riot October 19, 2006
 
1.
When a guy has inane, extended phone conversations with his girl instead of hanging out with the fellas.
Gregg: Yo, where's Luke, I thought we were getting shitfaced together.
Doug: Not gonna happen man. He's busy vagging out in his room.
by Doug E. Fresh Barcelona November 13, 2007