1 definition by Doobtronix

Top Definition
A brutal blow consisting of 5 knuckles generally to the jaw region named after "blck Jack Johnson," a black boxing champion from NYC.
Jamal served up a swift 5 jack to shawntiqua's jaw after she told him she was pregnant
by Doobtronix October 10, 2006

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.

×