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1.
1. when one has a one night stand with their best friend.

2. getting matching tattoos while drunk
Dude1: "Whoa, I just woke up next to Sally and we've been friends since 1st grade."

Dude2: "Well it had to happen sooner or later, but man that was an error in judgement."
by KathyJudy January 26, 2012