During oral sex, when a considerate man gives his partner warning that he's about to cum so she can stop before getting a mouth full. This indication is usual a light tap on the head. (a foreign concept to some men) Derived from a wrestling or fighting term used to indicate surrender.
My boyfriend is so considerate, he'll tap out when I'm giving him head.
A guy that is so consumed or obsessed with playing poker that he forgoes his basic needs (ie, food, water, sleep or sex with his hot girlfriend).
Q: What are you doing tonight?
A: Nothing. Poker Boy is at it again.