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1.
Wrestling hold where one arm is pressed under an opponent's arm from behind to the back of their neck.
It is a mistake to believe an alligator will passively tolerate a half nelson, no matter how drunk you are.
by Peter Urban May 16, 2006
 
2.
sexual position similar to the wrestling hold, providing maximun control by the man.
I was mad at Jill for making me wait so long, so when I finally got the ass, I put that bitch in a half nelson.
by James June 14, 2006