Keough
While at a bar, the act of saying something so off the wall to a chick that it leaves you and your friends around you instantaniously no chance of scoring.  

Kurt:  Joe, this is my friend Sarah.
Joe:  So Sarah, you going to give me a blowjob tonight or what?
EXAMPLE: Last night at the bar Joe was such a Keough it ruined any chances I had with scoring with that hot chick.