Definitions by Ric Tannerman

Butterflying 

When two or more people spread their arse cheeks apart and touch their bum holes together.

1. "Hey, I totally caught Jack and Jill butterflying behind the dumpster"

2. "Hey baby, we are in a comfortable and stable monogamous relationship, wanna butterfly?"

Butterflying by Ric Tannerman February 1, 2014