When a joke is over-used and becomes "dead". It was funny at first, but now it's fucking annoying.
Travis: So I was on top of the mountain yesterday....
Jacob: Your mom was on top of me yesterday!
Travis and others: Hahahahahahaha!!
Travis: Anyway, in the car...
Jacob: Your mom was in the car!
Travis and others: Dead joke bro. Shut up.
To get pissed on without expecting it; typically as a punishment for an unnecessary comment. Derived from 'dank', which literally means unpleasantly moist or damp. If you get danked, I assure you, you will be unpleasantly moist.
Brendan: Dude, you're such an idiot for thinking Selena Gomez is actually a good singer.
Landon: ARE YOU TRYING TO GET DANKED RIGHT NOW?! SELENA GOMEZ IS A STAR.