Made famous by the late and great Whitney Houston, it's proof that you are who you say are. You were where you said you were going to be. Because people like to "stunt", receipts are needed to validate lies and deceit.
He's a young whipper-snapper or young impressionable male. 2.) Nickname for a man in the urban community circa 1960. "Say, young blood you got a square?" 3.) He's a member of a territorial street gang in California.