Top Definition
When a fat kid emits a very loud fart during the middle of a test or lecture.
I was in the middle of the hardest question on my test when tubby next to me made the biggest butt siren I ever heard.
by john petrovskiiiiiiiiiiiiiiiii March 26, 2011

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.