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."
n. An individual who would normally be classified as a hick or redneck, but lives in a large city and may even have a job.
Cityhicks can often be found at home drinking alone and listening to George Thorogood. Typically opening the front door of a cityhick's apartment will slide one or more empty bottles of beer across the floor.
What is that cityhick listening to?
They guy above me gets drunk and blasts country music - he's a cityhick.