Top Definition
The act of smoking Marijuana, especially at 4:20am or 4:20pm. A play on the police codes for crimes.

Has more significance if smoking at 4:20am or 4:20pm.
Friend: *walks in* Whatcha doin?
Raditude: *holds up bong* Dude, we got a 420 in progress.
Friend: Can I join in?
by Raditude September 28, 2009
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.