Word used to describe girls that are particularly slutty, whorish or down right hookers
Andrew: Did you see that chick?

Josh: Yeah, she definitely has the tramp stamp of approval

OR

Joe: So you and your girl broke up huh?

Tim: Yeah, she had that tramp stamp of approval. I had to cut her loose.....pun intended.
by itzzzzzTPayne June 13, 2010
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