When to males have sex with the same person, they become Peter In Laws.
No shit? You banged her too?! That makes us Peter In Laws!
by bottoz September 28, 2004
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Two men who have had sex with the same woman.
John and Mark have both had sex with Sally. John and Mark are peter in laws.
by C Burn August 27, 2013
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A relational distinction. If you sleep with a girl, then your buddy 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.
Sean Penn (Madonna's ex-husband) is the peter-in-law of Guy Ritchie (and let's face facts, a bunch of other people too!)
by Jeff Lebowski June 10, 2004
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the sophisticated terminology used to describe any two male friends who have slept with one or more of the same women
leonard: you slept with betty? so did stan! You're weiner cousins with stan? wow!

elroy: weiner cousins? what, are you a billyhill? we're peter-in-laws you filthy savage!
by jedicollins December 9, 2009
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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
by BigOhDee July 27, 2023
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