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?
Payton: Whys that?
Colin: Did you ever see a black man drop a Niggermelon?
by Downs0 April 02, 2009
A measurement of joy, specifically the amount of happiness an African-American feels when presented with a single watermelon.
by UD_fan July 05, 2012