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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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abbreviation for Waiting Until Marriage,
meaning that you won´t have sex with anyone until you´re married.
It´s important for me that he is WUM.
by Tayend July 30, 2011
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The combination of the two words "Well" and "Umm" usually used at the beginning of a sentence when trying to think of a response
Kevin: "Yo ma, when we gonna go get our mahiganiggy on?"
Stephanie: "Wumm...let's bounce in 30!"
by accnt this August 13, 2009
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