A considerably large adam's apple, especially on a woman. If the subject has a skinny neck in addition to a prominent adam's apple than the "elbow" appearance is even more apparent.
Dude 1: Did you see the neck elbow on that chick who was hitting on me?

Dude 2: Yeah man. I bet she has a dick.
by manstuufff March 5, 2014
Get the neck elbow mug.