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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.
one mo by Fozzibab June 11, 2006

one mo' gain 

A more emphatic way of saying "again". Combines the phrases "one more time" and "again".
"That movie was so good I want to see it one mo' gain!!"

"I know you didn't just say that to me -- repeat yourself one mo' gain...."
one mo' gain by VaNellie September 9, 2005

one mo ginn 

one mo ginn by blackie November 24, 2003

One Mo Gain 

to do something one more time-the act of repeating an action in a derogatory sense. Usually used in a threating manner
"Call me an asshole one mo gain and see what happens"
One Mo Gain by pfcbenji April 18, 2009

One mo'gain 

To repeat; do again; do-over; another take or stab at it.
I'm finna' do dis bih one mo'gain, I ain't had enough.

Eh' take that verse one mo'gain, this time turn up!

One mo'gain - let's get this take right!
One mo'gain by Equeezy October 22, 2017

one mo ginn 

1)One more please. or 2)Yes, I would like another.
Bartender: You want another drink?
Drunk Guy on Stool: ONE MO GINN!
one mo ginn by vettespeedracer February 7, 2005