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3.
To laugh at, and gain a sense of satisfaction from, the misfortune of others, all while augmenting said satisfaction through the act of pointing. Boy, those Americans have a word for everything!
When Capone tripped over that corpse, I totally nelsonmuntzed him.
by The Other Randal Graves October 14, 2010
 
1.
An overweight, vest-clad 4th grader who enjoys to laugh at other's misfourtunes.
I hear Nelson Muntz just laughed at you after you fell down.
by Eric Hartman July 12, 2003
 
2.
Nelson Muntz is the school bully in the TV show "The Simpsons" his catchphrase is "HA HA!" which he expresses if he spots another character's misfortune. On a few cases however, the tables turned on him and everyone laughs at his misfortune.

He wears a vest over a t-shirt with shorts and is quite fat.
He is not as tough as he seems as in many episodes he has a secret enjoyment with cooking.
Nelson is in Bart's class and in the early episodes of The Simpsons he was Bart's Bully and in later episodes he and Bart became friends.
*Lisa walks out of a Barbers*
Nelson Muntz: Ha ha.
*Lisa Puts a hat on and walks off*
*Old lady falls into a bin*
Nelson: *Points* Ha ha!
*A very tall man drives by in a small car*
Nelson: *Points* HA HA!
*car stops*
Nelson: Crud.
Tall man: Do you find something comical about my appearance while I was driving my automobile?
Nelson: Yeah.
Tall man: Everyone needs to drive a vehicle, even the very tall. This was the largest auto that I could afford. Should I therefore be made the subject of fun?
Nelson: I guess so.
Tall man: Whatdja, would you like it if I made fun of your misfortune. HUH? Maybe we should find out!
*Tall man pulls Nelson's pants down*
Tall man: Now MARCH!
by Noslen June 08, 2013