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1.
abreviation of one more.
Dude, I really shouldn't, but give me one mo.
by ry3an7 August 15, 2007
 
2.
Short for "one moment". British and Australian slang. Normally used as an abbreviated form of "one moment" in online conversations.
Wait one mo, I'm gonna grab a sandwich.
by Fozzibab June 05, 2006