In a strict sense, the object being descibed has been subject to physical violence. When used as a slang term, the implication is that the said object is undesirable or otherwise crippled.
Strict: The police roughed up a criminal on drugs before arresting him.
Slang: "John's car is roughed up." This would imply that John's car has many undesirable qualities, eg. old, worn, broken, etc
Slang: If your grandmother cooked you a birthday cake and it looked like a lump of sand, you might say that cake is roughed up.
by Jess_B April 18, 2006
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Roughing up the clam, Scrubbing the clam, roughing the diamond, playing with yourself, getting off, spending some private time
by edenmanon January 14, 2009
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When a white nigga takes a hot 10 and throws her into the back of his 13 year old Cadillac and roofies her with a right hook to the jaw and leaves her there until she wakes up then he hits her in the eyeball with his penis juice and spanks her with his white penis
Did you hear about the girl who got the "Back Seat Rough-Em Up"
by ShrinkeeDickee February 13, 2018
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