Top definition
To drink a fluid, usually alcohlic, that is funnelled into the mouth with someone elses arse crack.
'He lost the bet and was forced to bum skull his beer'
by Hawker February 01, 2004
Mug icon

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