Top Definition
the act of a male running so intently with jogging shorts on that his testicles thwack painfully onto his leg.
Jimmy had to miss the marathon he had been training for because he ran sacked himself so bad during training he bruised a nut.
by EmeraldFirefly September 24, 2010

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.