Comes from the word neckle which means high grade marijuana, to beat up or destroy.

Necklin can be used to describe something or some one who is sick, bangin, ill etc. similar to word peng.
You seen bens new M3 its necklin!!

I just got sum chung tings numba, she knows im necklin!
by JB!"£ May 3, 2010
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A booby neckline that looks like the top of a heart (unisex)
Gio, your sweetheart neckline top looks sexy AF. Lemme cop a feel.
by KingKeyDaddy1999 March 28, 2023
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