2. A dirty prank pulled during drunken sex by males who are predominately considered dirty punk-rockers and are self-proclaimed scumbags. When the time seems right, the male sticks his thumb in his mouth and then pulls it out and puts it forcefully into the females butt while screaming "COBRAAAAAA!!!". This was the battle cry of COBRA (the badguys) in the cartoon "G.I. Joe". The main goal of this is to proclaim to everyone else in the house/area that you just jammed yer thumb in the butt of a girl who was not expecting it. Hilarity often ensues. Tough, scummy punk-rock broads often hit people over this or do it right back. Got you a free COBRA tattoo at one point in columbus, oh.
ex for 2: My old lady won't let me have a threesome because last time i tried to slip them both the cobra while i was getting head and most of my friends were downstairs.
That Cobra is at it again, attention seeking and trying to show off infront of her
"No, don't go for her she's into the cobra"