Top Definition
When the male penis becomes hard unexpectingly.
"Man my girl was staring at me all funny and shit, I look down, and my jock on block."
by Shak - A - Million September 27, 2007
5 Words related to Jock on Block

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.

×