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"Full of shit." For the same reason "porous" means "full of holes," "devious" means "full of deviance" etc.
Stupid Dude: Yo dudez! I heard there's like this fuckin crazy old lady at that run-down house, we should go check it out!!
Cool Dude: No way man, you're shitous.
by neithanthewronged April 27, 2006
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