Top Definition
A slang term, used as a euphamism for sex. It is short for "Making The Two Backed Beast." It started as a paraphrase of Iago's line in Othello, Moor of Venice: "Your daughter and the Moor are now making the beast with two backs." It is most often used online, and not pronounce, rather all the letters said. However, some people do prefer to slur all the letters together in one word.

Can be used in the past, present or future tense.

Alternatively, it can be used as an insult.
We Mttbb last night.

They're Mttbb in the other room.

I'm hoping to Mttbb with him/her tonight.

Go Mttbb yourself.
by Joel B. February 10, 2008

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

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