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When using in internet conversations or in real-life scenarios whether during AIM,, Myspace or other virtual texting messages, this is an abbreviation for "Make Up Your Mind". Just add the statement MUYM. Yesssir!
Gangster #1: Man I'm trying to go to the movies my good pal.

Gangster #2: Oh shit my brother let's come through!

Gangster#1: Ugh, nvm I got errands to utilize.

Gangster #2: Damn my good man, MUYM bro.
by Mister Nice Guy. July 06, 2009
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