Promoting someone or something into bigger than it actually is, constantly talking someone up as if it is always on your mind. The reasons for Don Kinging one can differ but there is usually an underlying reason. Named after former boxing promoter Don King.
Guy 1: "Man, Johnny is always gettin the girls, he can pretty much get any girl in this club"
Guy 2: "Dang bradda, your always don kinging the hell outta Johnny"
Guy 1: "Yeah, Johnny is really cool"