Top Definition
When a man or woman finds enjoyment in sticking bottles of carbonated liquid into their anus, and douching their pooper then pushing out the soda so hard it makes their butt fizzy.
Man, that was an awesome fizzbutt, there were bubbles everywhere.

I sprayed my fizzbutt all over her face last night.
by Dept of Fizzbuttology November 30, 2011

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