When you become so comfortable with someone that you no longer even refer to them by their first name. I.e. being beyond first name basis.
Man: "Honey, I'm home!"
Woman: "Hey baby, how was your day?"
Man: "It was great sweetheart."
Woman: "What's my name?"
Man: "Ummmmmmmmm..... sweetheart?"
Woman: "What, are we on no name basis now?"
by Rothdaddy October 30, 2006
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Sharing time and/or space with someone whom you moderately appreciate or have absolutely no respect for to the point of not remembering or deliberately forgetting their name.

Pouet: So, who you out with last night?
Tuatil: Arh! A bunch of jerk-offs. I wasted a whole evening with a load of idiots.
Pouet: Really? Who?
Tuatil: Can't remember. I'm on a no name basis with'em.

or

Rebacci: How's your new roommate Jelad?
Jelad: Alright I guess. We're on a no name basis which shows how much time I spend at home with her!
by Berg Sloe September 10, 2007
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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 9, 2007
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1. ukulele hip-hop band
2. refering to someone by their last name
You: I was hanging with Quinlan yesterday.
Joe: why'd you call John, Quinlan?
You: Oh. we are on a last name basis

I was watching Last Name Basis on Youtube yesterday.
by Reilly Matt September 22, 2010
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When you no longer need to refer to someone by their last name. Usally used when 1. two enemies (particuarly Jocks) are trying to end a fight or if 2. an adult wants you to call them by their first name.
Draco Malfoy: Hey Harry
Harry Potter: What so now we're on first name basis?

you: You have a beutiful house Mrs. Smith
Mrs. Smith: Call me Wanda.
You: Oookay that's a little strange
by Rainchecker22 August 8, 2007
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When two potheads smoke together enough times to learn the names of each other's dealers
Ya after those bowls last night, Rick and I are now on a dealer name basis
by Houghton Mifflin Books March 31, 2011
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When you meet someone online and refer to them only by their AIM screen name.
"So I had a nice conversation with swordfishx30 today."
"Ah, I see you two are on a screen name basis."
by Bennett Hansen August 6, 2007
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