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 3, 2005
Get the wum mug.
nobody knows what it means, only people who went to garage know this word. it means everything
by Willem. April 8, 2023
Get the wum mug.
= hot
= sexy
= attractive
very duplicitous in its definition
Louange is wum.
by zooplankton zoloretto January 4, 2021
Get the wum mug.
dude1: bush is a bloody errorist..
dude2: wum?
dude1: an idiot.. he keeps makin mistakes
by raz2416 September 4, 2007
Get the wum mug.
"Hey look, it's a wum!"

"My favorite candy I gummi wums!"
by Jitterbug May 31, 2014
Get the Wum mug.
The verb form of WUM (Wind-Up Merchant), a predominantly online phenomena of espousing contrary viewpoints purely to string people along and get a reaction from others. A mild-mannered form of trolling.
I know you're just having a laugh, but cut out the wumming, NewFag, or I will ban your ass faster than the angry fist of god.
by B9a May 19, 2011
Get the Wumming mug.