The act of rushing home to take a shit in your personal toilet, regardless of how many publicly accessible toilets are available within a more practical proximity. Named after Paul Finch from the American Pie films, who was dissatisfied by the lack of cleanliness of his school's facilities and would leave the building daily to defecate between classes.
"That was a long trip to the bathroom, Dude."
"Its not what it looks like! I was finching, so half of that time was travel."
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.