When a chick teases you really good and you think you're going to get laid, and then she totally stops. Like a dead arm, but more painful/important/cruel.
Dude with a boner: Oh my god baby you're so hot!
Hot blonde Sweedish chick: So are you! (playing with his dick)
Dude with a boner: So this means I'm getting laid right?
Hot blonde Sweedish chick: Nope. (As she walks out of the room and drives home)
Dude with a boner: Man! She gave me such a dead dick!