When an animal (most commonly a bird or reptile) inflates its neck area in an attempt to impress or intimidate.
That King Cobra is pissed, check out its neck boner!
by tamburlaine May 08, 2009
When you get hurt so bad, your spine can be seen in your neck
My friend crashed his car, the doctors said he had a Neck Boner
by NateTheHater April 12, 2014