When you get your friends girlfriend so high on his birthday that she pukes and passes out. Making him unable to get laid. The worst cock block ever.
the scott gave emma a bong rip. she pukes,passes out. her boyfriend arrrives and when he sees whats going on he says "dude! whyd you do that? now i cant get laid. dude. that was the worst cock block ever."
by thank god that wasnt my girlfriend March 26, 2007