Top Definition
The act of sitting on a toilet backwards, so your knees touch the wall behind the toilet, and pushing excrement through the anus, so that it spills down the front of the bowl and stains it really badly.
John: For fuck's sake, Mark, I can't go into that toilet.
Mark: Why, John?
John: Some prick did a Reverse Canker in there...
by jack french November 08, 2006

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