Top Definition
A general name for a guy who makes disgusting jokes about butts, assholes, shit, etc. as well as sexual acts relating to butts and or shit. Marcbutt also knows the name of obscure sexual acts. Can be used as a term of endearment if you enjoy Marcbutt's jokes and knowledge.
A chick gave me a stingbug last night when we were fucking and it reminded me of Marcbutt.
by NiGroo April 26, 2011

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The butt of Marc (with a C). Concave in nature, this butt resembles two craters side by side.
Wow, that's one heck of a marc-butt. I bet you could eat cereal out of those cheeks!
by MagnificentMarc August 02, 2016

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt