N. A combination of contradict and slap. It is when you are opposing someone and they slap you without thinking, usually from anger.
Metro Guy:"Yeah, I've been being in the bathroom a lot lately, so me and Joe are fighting over who should get more bathroom time...he got mad and I got a contridislap."
Other Guy:"Oh, my, god, did he say sorry."
Metro:"Yeah, he was just mad...I deserved it."