When something is so ridiculously shitty that it should not be possible. Can be compared to a girl having diarrhea during anal penetration.
Matt: Dude, last night was absolutely reshitulous.
Joe: Why's that?
Matt: I was backdooring Sally and she liquid shit all over my cock. That bitch is getting dumped!
A term to describe somethingabsolutelyfucking bonkers; should only be used in the most extreme cases. Meaningless or incorrect use of the word shall lead to a punishment a minimum of 15 lashings.