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2.
Originally a contraction of the phrase
'Not a lot' it is often used in place of phrases that begin with 'Not a...' or in some cases in place of a negative.
What are you doing tonight?
Notta

Do you know if he is going to show up?
Notta
by Euano April 02, 2009
 
1.
Opposed to popular belief that "notta"="nada"

notta actually is taken from the phrase "not a thing"

In short, notta just "not a" smacked together.
Hey Bill what you doin?

Notta damn thing, Greg.
by Ryan H October 12, 2004
 
3.
=Nothing.
-What did you do the last night?
-Notta!
by Fangsta March 17, 2003
 
4.
a gay person better known as a homosexual
eg, its a notta
by shelden grome November 27, 2010