Top Definition
When two males have sexual relations by pushing each other's assholes against each other. Also known as "outercourse"
Dirty Randy was tunnel bumpin' so much he couldn't sit down for a week.
by ItsTorgy November 19, 2013
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.

×