Comedy lingo: The act of revising a joke to make it more vulgar and offensive. Usually involving the addition of rape, pedophelia, cancer, or any other generally offensive topic.
I was fitching up my jokes for dirty joke night at the comedy zone.

We brought new writers in because the script needs some fitching up.

That joke is a too clean for this crowd, you should fitch it up a little.
by Ira Cohensteinbergold August 11, 2012

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