The act of a man having sex with a woman by repeatedly stroking his penis under her armpit. The term is similar to armpit sex, the armpit fuck, or dick in a headlock. However, it differentiates itself through the use of household items such as butter, margarine or cream as a lubricant to entice the woman to lick the penis as it protrudes from her armpit.
Man, I got a mean burn in my armpit from a Molly McButter last night.

I had to de-grease my penis after giving some Molly McButter to my old lady.
by Metairie Eric February 13, 2009
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20 Something girl who dresses like she is 80.
by Joe March 24, 2005
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A plain jane type female, often associated with the term 'white girl' -- though not always, generally at least loosely associated with a sorority.
I can't picture that Molly McButter getting down.

I'm not down for no Molly McButters.
by anonymous February 1, 2004
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obese people how think they are still skinny thus having to use butter to slip into their pants.
Hey stev why dont you use country crock to slip into those fatty mcbutter pants
by fatty mcbutter February 4, 2009
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an enormously obese transvestite that has duckbutter seeping from the anal cavity of the rectal sphere, while staining the pants and can only be removed with Tide.
Did you see that fatty mcbutter poopy pewp style at the fair last night?!?!!?
by Big Teddy Poo December 2, 2006
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