The act of KSING a team player on purpose non stop and denying it. When you get the KS, you scream WHAT A BILLY in an Irish accent. Genius.
Player1: OMG MAN U KSED ME SO BAD!!!
You: WHAT A BILLY
hiberno-english slang for 'what's your story?/what's the craic?/how are you?/what are you up to?'.
(in the pre-mobilephone era) upon meeting your mate at McDonald's on Grafton street: you: 'hey, what's your billy?'
him: 'fuck all.'