the males genitalia has many nicknames, willy being one of them, here are some examples, cock,ween,peen,pp,dick and the most OG name for the willy is, PENIS.
guy 1 : how big is your pp
guy 2 : do you mean, willy
guy 1: oh yeah i guess you can call it that.
guy 2: Yeah mines 72132828433293 inches.
guy 1: damn bro, but your still single.
*gun shot*
*body drops to the floor*
guy 1: pog champ