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The act of inserting an ecstasy tablet into the anus, in an attempt to maximise the effect of the drug.
Get that pill out of your mouth!

It's destined to become a Fizzy Bum, and it's headed straight for my arse.
by Edward Honda July 12, 2008
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It is the fizzy feeling in your bum when you need the toilet
It's time for the toilet I got fizzy bum
by sexyeyes1978 April 15, 2018
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