A fagslam is when you get fed up with a gay guy being annoying, and you uppercut him in the cock n' balls. This will stop his faggy antics from ruining a party, talking to girls that you're trying to hit on, or just plain on being a fairy.
That gay guy Chaz won't stop cock blocking me at the bar. He keeps talking to all the chicks about clothes shopping and his make-up routine. I'm going to wait till he goes to the bathroom and fagslam him at the stall.