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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A Fitch Up is pulled when pretending to resign from a job. They key is to get re-hired after only a week or two of leaving.
Worker 1: Man, I can't believe he's been gone a whole week now.
Worker 2: Didn't you hear? He's starting back on Tuesday!
Worker 1: what a classic Fitch Up.
by CL1LN0 September 5, 2019
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