To throw out compliments alone at the bar, but tell people your friends were too drunk and went home. Usually a joecow leads to people buying you drinks because you were nice. Also used in the context of rollerskating in short shorts in a large public areas.
yo, I just joecowed that chick and she bought me a shot.
Dude. I saw the funniest thing, a dude was joecowing down Sepulveda and some drunk homeless lady tried grabbing his dick.