Top Definition
When you have anal sex and stimulate the girl, a split second before she reaches her climax, you pull out and slap her as hard as you can on her loin causing the pain to be interpreted as pleasure by the brain and resulting in a total relaxation of the bladder and sphincter causing involuntary disposal of urine and feces.
She wanted such rough sex I buttbeam -ed her. We had to buy a new madras because I gave her a butt beam.
by Darlen April 05, 2010

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