1. (phrase) Contraction for "fucked your mom". Used when one does not have a witty comeback handy. Can be countered with "chur mom harder", but then "chur mom hardest" wins. No triple stamping of a double stamp or anything of that sort. "Touché." is then said bye the loser to recognize the supremacy of the relatoins had with his or her mother.
2. (noun) another way of saying your your mom.
1. A: "Chur mom in the butt."
B: "Chur mom harder in the butt."
A: "Chur mom hardest in the butt."
2. "Hey where's chur mom at that bitch hasn't given me a rim job in at least two days."