2 definition by McTastic

Top Definition
The act of shitting oneself whilst wearing tight biker leathers or racing suit.
'I almost crashed my road-bike yesterday, and ended up dirtbiking'.
by McTastic January 26, 2006

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Penetrative sex using the hole provided by a colostomy. The recipient may or may not actually be alive. Tubing may also be combined with a mung should a suitable candidate be available to provide a true rush for sicko-thrill seekers.
Nightshift in the morgue was generally boring until Liam discovered tubing.
by McTastic January 26, 2006

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