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When your friend be doing some dumb shit so you need to be discipline them with a firm slap on the neck.
"Yo what's 2+2"? "young blood i think it's 8". "Nigga that's a neck".
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by neck,necking,dumb thot December 11, 2017
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when someone says something totally wrong or realy stupid you slap their neck and say thats a neck! gets really annoying yolk neck
Hey 2+2=5

Thats a neck!
by the who 123456789 April 25, 2010
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When someone says something so stupid you can't beleive it and you totally reject the fact that they are a straight A student.
One day I was walking down the beach with some friends when one of them shouted, "Look at that dead bird!" Someone looked up at the sky and said, "Where?" <tHAT is a Neck!!!

My friend and I were eating our lunch in the cafeteria, when we overheard one of the assitant teachers talking about the sunburn she got on her weekend drive to the shore. She drove down in a convertible, but "didn't think she'd get sunburned because the car was moving." That's A Neck!!!
by Thatin' May 31, 2007
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The act of slapping one in the neck for an unfortunate event that occured mentally or physically
Charlie trips over his feet so someone says "thats a neck" and slaps Charlie in the neck.
by Who? Mike May November 05, 2005
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When you say something that doesn't make sense or something stupid. When someone says a neck you swipe there neck as hard as possible. To not get necked you must say no neck.
Your watching the World Cup and the guy sitting next to you says when will Barclona and Argentina verse that's a neck.
by hero brine June 04, 2015
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when you say something really stupid and someone says "That's a neck!" Ya might wanna say 'self serve', 'soft serve' or 'mirror'. Self serve is when you do it yourself, soft serve is a light slap in the neck and mirror is when you do it to the person who said "that's a neck". A neck is when you slap the shit out of their neck.
Girl : 2+4=8 !
Boy : that's a neck
by TbhImElyssa May 14, 2016
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When someone says something dumb and you need to hurt them, but not so much that they cry. Just enough for them to know they a dumb motherfucka
A slap on the back of the neck
"Aren't fingers and toes the same thing?" asked Gouda.
"Uh," I started. "that's a neck."
"Aw man", said Gouda.
by N.Y Nora July 23, 2018
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