veritable is a formal way to say "real" in this case. Like real or authentic ... I think similar to справжній in Ukrainian.

The word "veritable" is used as an intensifier or to emphasize the truthfulness of something. So in this case, it is showing that he is the true and real MacDaddy.

DO you mean "variable"?

A MacDaddy is someone who has success with girls also known as a Chad. Veritable here means that his friends and the girls agree that he is in fact successful at obtaining phone numbers, kisses, and most often sex.