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

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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

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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

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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

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