Top Definition
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.
by potatoninja August 27, 2015

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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!
by Kaydaymuchluv81 December 01, 2011

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is when you see an ugly person that has some how made themself look attractive through clothes, make-up or other non-plastic surgery enhancement. To test this on someone after a few cocktails (less than three) consider if you would park the love rod in the ham wallet. If yes: "I can't beleive its not butter!" - if no: see fugly.
"Wow, have you seen what Sally is wearing? She's sort of cute now."

Yeah, I know! I can't believe it's not butter!
by prosebrosproductions June 17, 2010

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Insult used with somebody's name, used if the person has man boobs
"Whoa, you see that guy's man boobs?"

"Yeah, I can't believe it's not butter"
by The Teacher, PhD in swearing July 15, 2009

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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.
by tkifr March 02, 2008

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The Urban Dictionary T-Shirt

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