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An insult to tell some you don't beleive what they are saying.
In other words, the thing they are saying is so unbelievable that you tell them to spread butter on your arse.
Man 1 - Geoffry, i'm gay.
Geoffry - Oh, butter my arse
by hahaha July 22, 2003
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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2
A state of unfathomability at a comment made in polite audience.
Reg Holdsworth to the Queen: "oi you stink"

Queen: "Butter my arse Reginald"
by Fazza1 October 09, 2006
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3
Term said to a man when their partner wants to engage in anal sex and needs lubrication. Taken from the infamous 'Last Tango in Paris' scene.
"I'm on the blob tonight Archibold, you'll have to butter my arse if you want any."
by The Strut October 11, 2004
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