To ruin, spoil, sabotage, make annoying or generally increase how shitty something is.
"Wow, that presentation really sucked."
"Yeah, it could have been good, but Mitch wouldn't shut up - he tends to shitten things."
by Eileen Fitzpatrick March 12, 2010
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A nostril scorching, sphincter shredding cacophony of ropey pan slamming turds.

A bog grenade often tromboning out of the anus.

Side effects include; hallucinations, retinal bleeding, projectile vomiting, suicidal thoughts/practices, ear infections, giddiness, hair loss and partial deafness.
A heavily sedated Daley Tom lay motionless following his double hip replacement as a consequence of his giddying atomic shitten episode.’

‘Health experts have confirmed the accident was triggered by furious and animalistic honeymoon bumming’
by Herbie Dongsporran August 30, 2022
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The end result of having to drink horrible, horrible gloop as part of bowel preperation for procedures such as colonoscopy (also known as Geting An Anal Probe). You end up spending much of the night shitting so much that one is surprised at just how full of shit you really are, hence The Great Shittening.
Tonight is The Great Shittening. I have to drink that horrid gloop so as to have a clean bowel for my anal probe tomorrow.
by RTM 1963 October 16, 2017
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When your day is going like shit but you still don't trust it and something shittier finally goes down.
Similar to the fuckening, just fucking worse.
by Dilan K. March 20, 2019
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