Top Definition
It is an acronym for "it sucks to be you ...
in a situation where you are in a better condition than the person, so you can sarcastically said to the person that --> "ISTBU - it sucks to be you"...
by mastermind@little bird November 29, 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.