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

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug