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1.
A watermelon, more specifically one that is either produced in the south or in the hands of a black man.
Colin: Did you hear the NFL is switching to green footballs?
Payton: Whys that?
Colin: Did you ever see a black man drop a Niggermelon?
by Downs0 April 02, 2009
 
2.
A measurement of joy, specifically the amount of happiness an African-American feels when presented with a single watermelon.
The child was so happy on Christmas morning he beamed a 3 niggermelon smile.
by UD_fan July 05, 2012