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1.
A disease that is usually inherited at a young age it starts when the patient is a infant and a black ring forms around the neck, as the patient grows so does the black circle and eventually covers the whole back of the neck.
Person 1:Man have you seen Xavier and Anthonys neck?

Person 2:Yea man it's so black!

Person 3Talk about a dirty neck!
by A Clean Neck Person June 24, 2010
 
2.
A hard slap on the neck when some one is being stupid or dumb
WTF! why did u do that i m going to give u a dirty neck
by hawaiian_flip_boi May 18, 2005