Basically a polite way of saying "whomp on my meat" AKA masturbate or jerk off. It is used to indicate how hard you intend to beat off and pulverize your meat due to how hot and attracted you are to someone or something.
Also sometimes written as "Womm" or "Woi"
Julio Gomez: bro that thick pawg BrianneFoley, is about to do the weather forecast
Mike Adriano: good looking out, I'm definitely about to whomp on it to her phat ass and side profile
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi