To disrespectfully slap someone in the face with an open hand. The implication is that the person being slapped is not manly enough to be worthy of a real punch. Very similar to "Bitch Slap," but because of the recent Chris Brown and Rihanna debacle, 'bitch' has been replaced with 'Chris.' Term is used figuratively to mean putting someone in their place (or diss) in no uncertain terms.
If Jason dosen't have my money, today, he's going get Chris slapped!