What is Peter-in-law?
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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!)
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This is a sarcastic answer to a question with an obvious answer of "yes." Taken as a combination of the similarly-intended on..