It's a very old word used in the early 80's. Bumpin: adj. something is cool, or hip.
Those shoes are bumpin.
your gear is bumpin.
The act of closely following another vehicle, almost literally sitting on the bumper.
Driver 1: Two drops of rain hit my windshield so I'm going to drive 2 miles per hour.
Driver 2: I guess I'm going to be bumpin' this guy all the way down the road!
Welsh slang. Used to describe something / someone that is less than appealing.
Mate, don't ever go to 'Taybarn's, the food there is bumpin'.
Did you see that girl Briggs pulled last night!? She was bumpin'.
bumpin is the action to physically touch or “bump” in my asshole.