Top Definition
The unfortunate event when fecal residue is left around the anus and the person in question does an activity which involves great exertion. This exercise leads to sweating and consequently blends with the faeces to form a substance known as 'Bum Oil'.
Dude 1: that was a great round of tennis
Dude 2: yeah dude, but we should have stopped earlier, i've got bum oil running down my leg!
by Pretty in wellies May 31, 2007

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