A very rude, offensive, and arrogant person; Jumps into situations one doesn't belong in, or acts out of nowhere.
"Really? Leaving dirty dishes in the fucking sink again ?!" "Okay, jump cunt. I haven't been home for 3 days. How was it me?"
"I can't believe you did that to her! I'm going to kick the shit out of you!" "Fuck you, jump cunt! You don't even know the whole story!"