Top Definition
anal sex, and the prelude to an amusing rhyme which kids at school write on each others textbooks to get their friends in trouble:
up the bum, no harm done!

additions:
with a thumb, twice as fun!
with ya mum, watch me cum!
by me old fruity September 30, 2006

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To take someone from behind
Jazz takes Izzy up the BUM
by Jazz B (+ Mike J) March 25, 2003

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when michael takes random people (e.g his father) up the bottom
by Anonymous April 01, 2003

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The Urban Dictionary Mug

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Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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The ramming of aerodynamic and not so arodynamic objects up the hrmm... anus
Everybody goes to take michael's mum up the bum while he watches in dispair.
Then he decides to go take some tall dark and hansome man up the bum in a dark alleyway, allllll night long. Bless his little gay soul

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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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