Top Definition
Negative mental attitude.

Opposite of pma or positive mental attitude.
Quit it with the NMA. You're such a pessimist.
by himynameistj January 07, 2011
"Not My Art". Mostly used in the tags section on Tumblr to appreciate someone else's artwork without having other bloggers think you stole it. It's mostly a precaution.
*Drawing of a cat*
#AWW LOOK AT THIS #cats #kittens #nma
by flavortown August 09, 2016
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