1 definition by a nony mousey

Top Definition
n: InSignificant Other. The person that you happen to be with but would rather not.
"I fought with my ISO last night."
"Man, why don't you just dump that bitch?"
by a nony mousey February 11, 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.