1 definition by Jim The Clown Hater

Top Definition
When you know someone well enough that you call them by their first name.
I had known Mrs. Jones so long I always called her Martha. We are on a first name basis.
by Jim The Clown Hater August 09, 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.