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1.
people use "Oh Girl" when they don't want to use the girls real name OR just forgot the name of a particular girl.
its also a shorter version of saying Jane Doe
did you her about Oh Girl getting fired?.,

i'm going to take Oh Girl out tonight.,
by Phillip Jennings September 16, 2007
 
2.
A song by Paul Wall
A song by Ginuwine
A phrase that you say when you miss that speacial one that is the one for you
Oh Girl *while sitting in an empty room
Did you listen to Oh girl?