The act of ambushing your male friends with a girlfriend to an event after it was clearly understood no women were welcome. Typical events include testosterone only poker parties and sports events or estrogen chasing social events such as street festivals or house parties in which it is understood do NOT bring sand to the beach!!!
I can't believe John bushwacked me at the door with his girlfriend. Yet, the poker party invitation was specifically clear - No Chicks Allowed. So, I had no ploblem with turning him and his lady away.