Top Definition
A case of severe diarrhea which "varnishes" the toilet brown...also called "Toilet Paint".
Toilet Varnish is extremely difficult to clean if it is not flushed within a week.
after all those grapes i needed to go varnish the toilet...

i said to my sister: "I'm not cleaning your Toilet Varnish!"
by FNX August 30, 2005

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