Top Definition
1) To play by rules which should not have to be said.
2) The application of common sense to a situation.
John - "Ok guys, 5v5 full court. Big Boy Rules."

Mike: "Dude, I was going to hit on that chick but then you stepped in and ruined it for me."
Steve: "Sorry bro, BBR."
by Sledge2k June 20, 2007

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