An inside joke or private reference that never successfully makes it on Urban Dictionary.
Votee: SallyHermaned - When my sista Sally does that thing she does! #lmao
Voter: Don't allow. Wow, what an Inside Shit. Brainfart much?
by DeiGoiCah July 28, 2018
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When something is so unbelievable that the phrase "are you shitting me?" is not enough. It demonstrates that the action taking place, or the event being described is so monstrously horrific that it literally feels like someone is taking a massive shit inside of your chest. Basically, the worst feeling ever is happening, and at this point you're questioning why the fuck.
Douche: LOL I TOTALLY RAPED THIS CHILD WITH A PITCHFORK OF AIDS
Person: ...are you shitting inside of me?
Douche: ...No? But I could be.
by JustSomeFaggot September 10, 2010
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