Top Definition
A penis that is at least 33% larger than the average male genitalia. Derived from Pen20--when Pen15 isn't good enough.
You're in the Pen15 club? Pssh. I've got at LEAST a penzo.
by That EFFING hurts! January 03, 2011
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.

×