short for neck-chin, it is used to described the act of an obese, german prostitute getting overexcited while in the presence of ice cream, causing her to have a heartattack on the floor, which from a precise angle, gives the appearance of the chin becoming one with the neck.
(Adjective) A name you call someone/something when it's being:
A) Annoying
B) Stupid
C) Not going your way
D) Or is a grandma in my language
A) "Ibby! Stop being such a nin"
B) "Joe's a nin, he fell into a thorne bush by a little poke and fell in slow motion" (true story)
C) "My iPods such a nin"
D) "Lets visit nin"