Top Definition
The act of masturbating under your blankets. "Opening the Umbrella" refers to the similar movements and look of someone opening an umbrella.
1. Jim: Dude, I just caught Billy opening the umbrella in his bed!

2. Earl: Oh! What are you doing there?

Steve: Nothing. Just opening an umbrella under here.
by Ol' CB August 05, 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.