stands for the words, videos and games; when a group of men gather to play video games and talking about vag and anything else about the opposite gender.
Hey dude, ready for VAG night? We're gonna play some cod and talk bout some VAG!
brian: hey guys, wha...YUCK! What is that smell? Grandma! close your legs! your vag smells disgusting!
grandma: something smells like tuna...i think i'll go home and make some tuna sandwiches.