Top Definition
To shrug someone off in a manner which leaves them unable to retaliate effectively, most frequently by responding to a poorly-structured/purely subjective argument with a simple "no."
"<pointed, yet asinine question>"

"I'm going to have to invoke a Madjackass on this. No."
by Gault April 03, 2005
Free Daily Email

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

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×