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"
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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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Something uttered by British people after they've been suckered punched. Usually preceded by the exclamation "Aw fuck", and accompanied by a look of complete bewilderment.
British guy: Blah Blah Blah Blah
British guy's friend: *punches British guy in the face*
British guy: "Aw FUCK, I can't believe you've done this!"
by Susake November 08, 2007
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What Peter Griffin likes to say at random times, usually after other characters say "I can't believe..."
Meg: I can't believe I'm still jealous.
Lois: I can't believe I touched him.
Peter: I still can't believe it's not butter!
by Chesspiece#1 July 01, 2010
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the new meme, originating from the infamous youtube video

http://youtube.com/watch?v=8lBO23Dh23I
pete: hey, say thanks to your mum for me
sam: aw fuck, i can't believe you've done this
by crincled January 03, 2008
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When a person has a killer hot body but person's face isn't even good enough to be a butter face.
Ed: She's got a serious body on her but she's got the worst case of but-her face I've ever seen

Dave: Dude, she's got an I can't believe it's not but-her face.
by hcd631 June 27, 2011
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something a guy said because he can not believe no one bought those.
Guy 1: These are new! I can't believe no one bought these
by July 29, 2021
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