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It is an acronym meaning Wind-Up Merchant.

It refers to someone who posts on message boards and newsgroups with the intention to cause as much disruption as possible by goading others.
He's a WUM, just ignore his posts.
by Nataku November 03, 2005
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Jun 21 Word of the Day
A person with an outwardly dominant, masculine, or aggressive personality, but who also enthusiastically takes on the submissive or "bottom" role in the bedroom.
"I'm tough, Mike! I never give an inch! I'm partial to taking a few though..."
"Ah, you're a real pipehitter."
by Skeletalchemy June 15, 2021
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"Hey look, it's a wum!"

"My favorite candy I gummi wums!"
by Jitterbug May 31, 2014
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"Wum" is the female discharge or female Cum. Womanly cum thus the everyday word WUM.
"Holy crap Bertha, you got wum all over me!"
by ahhhhbigail October 10, 2005
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Cum created from pure will power.
Dude, I made Jennifer drink my wum.
by linw0724 April 18, 2010
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