What does black on blond mean?

black on blond meaning in Urban Dictionary

A mixed alcohol drink, like a black and tan, made up of Guinness floated over Stella Artois. The ratio of Guinness to Stella should be a little greater than in a black and tan.The plural form is positioned regarding the very first word, as in:singular = black on blondplural = two blacks on blondSee also blond redhead