alien fistbump

A greeting found in some parts of the mid-west United States where in partners stand very close and proceed to press their pelvises together whilst knocking on the butt cheeks of their brethren with their fists. Quasi-sexual. Usually reserved for close, or odd persons. Alien in human nature, not in a cosmos way.

Man, I hadn't seen her in so long I had to give her an alien fistbump.