Top Definition
A over the counter supplement that causes vasodilation.
Also A chemical that makes you have really hard boners.
"This L-arginine gave me a ninja boner. I'm going to go chop down a building!"
by IONG August 18, 2008

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.

×