1 definition by Greg J.B

Top Definition
The smell that exists when a bunch of teenage boys sleep and eat in the same room for over 24 hours without showering. If you experience the ass muffin smell you are advised to internally combust, because your life is over.
zomg that hax! He UnleasHED a nasty ass muffin smell!
by Greg J.B March 21, 2007

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.