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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 12 Word of the Day
Solarpunk is a movement focused on a positive, ecological vision for a future where technology is used for human-centric and ecocentric purposes. It is a literary, artistic and aesthetic sub-genre and is also closely tied to eco-political activism. Solarpunk narratives have a distinctly positive and utopian foundation in contrast to the often dystopian visions found within other "punk" science fiction genres.
Solarpunk is a literary movement, a hashtag, a flag, and a statement of intent about the future we hope to create.
by wix99 September 20, 2016
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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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