i cant believe its not butter 

when you cum on a girls back and or bread then spread with a butter knife. She then eats the bread on her back you lie down on her back and you get stuck to her.

i did a i cant believe its not butter to my girl last nite.

i cant believe its not butter by tkifr March 2, 2008

I can't believe its not butter face 

A girl who is so ugly you can't bare to look at her. But her face is actually not that bad.

Rob "Yo check out that huge b*tch"

Dimitri "Wow shes huge but her face isn't that bad"

Greg "Holy shit she's got an I can't believe its not butter face"

I can't believe its not butter face by Daga Jobin August 4, 2010

i cant belive its not butter 

but chuck norris can

e.g.
randome1: i cant belive its not butter
randome2: chuck norris can
randome1: no dude just no
randome2:watch what you say chuck norris might round house kick you

i cant belive its not butter by maderthanyou January 21, 2009

I can't believe it's not butter! 

A butter substitute made of vegetal oils and frequently used as a spread. Sometimes its name is used as a humorous/sarcastic reference to a sub-par substitute to something.

<Eats a piece of toast>
- Just a moment, is it butter?
- No, it is "I can't believe it's not butter!"
- Well, *I* can believe it is not butter.

I can't believe it's not butter! by potatoninja August 27, 2015

i can’t belive its not butter 

The fucking stupidest shit u can name a product

I can’t belive its not butter!
Kys

i can’t belive its not butter by Lukiboss May 29, 2018

I can't believe it's not butter! 

The exact opposite of a butter face. A girl who has a great face but not a good body.

I diagnosed myself with I can't believe it's not butter! I so need to start working out!

I can't believe it's not butter! by Kaydaymuchluv81 December 1, 2011

I can't believe it's not butter! 

A popular phrase to say when you are currently in denial that what you have been served on your warm toast is not butter, but rather, margarine.

The phrase became especially after a brand of margarine used it as their name, to show just how their margarine was more similar to the real thing, however, now it's pretty normal that margarine tastes like butter.

Person A: This toast is so tasty. What is the brand of butter you use?
Person B: That's not butter, that's margarine.
Person A: What? I can't believe it's not butter!

I can't believe it's not butter! by Sionw October 14, 2018