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1.
Means "Mom" in Korean.
My umma is hot.
by Dreamboat Supreme April 17, 2004
 
2.
Synonym for the phrase "I'm going to".

(Note: When used in conjunction with gonna, umma should not be confused with Ummagumma)
"Umma hit that when we get back to da cree-ib, yo."
by Zor Prime November 25, 2003
 
3.
When you're stuck introducing someone who isn't your boyfriend/girlfriend, but they're definitely not just your friend either. Contraction of the phrase "Umm" and "Uh"/"Umm... Uh..."
"Why Jeffrey it's so good to see you again! And who is this lovely young thing you brought with you?"
"S/he's my, umm... uh... My umm, uh... S/he's my umma."
by Micky798 February 26, 2014