A tattoo, typically placed on the lower back region, depicting the San Francisco Giants 2010 World Series Championship win. Commonly found on middle-aged men, the tattoo typically is usually associated with mild obesity and hairy backs. Typical reactions to the champ stamp include, but are not limited too, drunken embracements, high fives, and/or illusions of the men convincing themselves they actually had something to do with the victory
Bob: I just got a champ stamp!
Jerry: Whoa, I just got a sudden urge to touch you.
Like the female tramp-stamp but for dudes that are tryin a little too hard to be cool and end up looking like a dork.
Champ 1: Yo mate, I got me a tattoo of of a broken heart with barbed-wire around it and "mom" across it.
Mate 1: Cool, where, are your arm or chest?
Champ 1: No, Scooter, it's on me lower back(turns around and lifts shirt to display tatt)
Mate 1: Ahh, lovely Champ-Stamp, Litte scooter!
When someone has a tattoo on their lower abdomen (where women get menstrual cramps).
Ryan: Brosef, did you snag a peek at that girls stomach when she lifted up her arms?
Martin: No you perv.
Ryan: She had a cramp stamp, broheim!
Martin: I hate tattoos.