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Relaxing like a wino; laid out anywhere convenient and usually due to being inebriated. Happily lazy in some form of intoxication. Can be used to describe relaxing without intoxication, but implies general unawareness of the world at large.
Q: Did you go the club last night?

A: Na, I got case and was bum chillin on the porch.
by your real name, tryina tellme October 23, 2010
Relaxing somewhere besides ones home, wearing clothing found in on the ground in the area of said relaxing.
Steve: Yo, where'd you get that sweater?
Paul: I was Bum Chillin' at the skate park and found it in the garbage can.
by niminamph August 16, 2011