Someone who jumps on other peoples style. Originally is was for someone who copied tape to tape and then played it back for another audience reeking the reward of good style. It has been expanded to clothing, hair styles, tattoo's, piercings and even figures of speech.
Cool Guy "Damn, did you see John's Tattoo?"
Cool Guy 2 "I saw that on Paul at the party we were at two weeks ago, the ladies dug it!"
Cool Guy "OH man what a tape theif!"