1. A drinking game played with cards.
2. When someone is so drunk, they keep drinking and keep on talking like a cockass.
1. Hey, I'm inviting some people over. We're gonna play yak trap. Wanna come?
2. Haha! Ben's caught in the yak trap!
A Yak Trap is a term created in March 2009 to describe a loose female.
"Better scrub that dirty yak trap!"
"Nah dude, don't sleep with her. She has a yak trap"