Top Definition
One who could also be described as a jackass, but an even more onerous diss that compares them at the same time to a jimmyhat.
I really hate jackhelmets that won't let me merge into traffic.
by diablito April 29, 2006
7 Words related to jackhelmet

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.