the sophisticated terminology used to describe any two males who have slept with one or more of the same women. Usually, said women are thots, badge bunnies , neighborhood trash or from Naylor Georgia,which would group all these as a whole . It's A relational distinction. If you sleep with a girl, then an acquaintance sleeps with her. You are his peter-in-law. The relationship is one way. You would not be his peter-in-law unless you sleep with that girl again *after* him.
I am peter n' laws with everyone