Verb: As opposed to the form of dance spelled with a K, crumping is the act of putting your hands in your pockets and grabbing someone through your pants. Additional points are given for rhyming by way of crumping someones rump, jumping into a crump, or crumping Donald Trump.
I'm gonna crump Denise right now.
*puts hands in pockets, grabs denise*
Denise: WHAT THE HELL!?
Me: You've been crumped. I love crumping.