A wrinkled, retracted penis of old dudes in the showers at a swimming pool mens changing room. Mini means small, billy means willy. These are comparable to party weiners at get togethers and other various social events.
"Kieron, its a minibilly fest today!"
by Dr Billy December 14, 2003

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.

×