The facial expression you get when you're faced with an awkward silence cause by an ignorant comment that everyone seems to have ignored. Numma can also be frustration, anger, or confusion because of any given situation. Numma can occur after a racial slur, a demeaning act of hate or when that asshole next to you decides to steal your chicken.

Side effects of Numma may include:
headache, depression, facial irritation, itchy balls, or a simple brain fart.
Wtf man, numma, numma numma.
U see me numma right there? that guy is such an asshole
numma, wtf am i doing naked?
numma, i jizzed myself. (mom saw it all)
by nummanum March 8, 2010
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Senegalese slang for "a meaty girl".

For added emphasis, chum chum can be added to the end of the word.
Example One:

John: Damn mane, look at that numma chumma.
Bob: No way you dumbis, that girl is as flat as cardboard.

Example Two:

John: Yo, check out that numma chumma.
Bob: Damn mane, that ass fine as hell...numma chumma CHUM CHUM
by Scott Warshire August 16, 2007
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