George: "How was last night?"
Duff: "Okay"
George: "Why just Okay?"
Duff: "So I was making out with this chick, right?! She pulls off my underwear and just when I'm thinking that I'm about to score, she takes out a huge black dildo! So I ask, "Are you serious?!". And she's like, "Bitch, I'm shnirious."
George: Holly shit. Are you serious?!
Duff (pulling his pants off, and bending over to show George the scars on his ass): "Dude, I'm fucking shirious!"
used in the same way as 'hideous', however with the implication of extreme messiness and ultra foulness.
My ex-wife finally met my girlfriend, the one I was cheating with the whole time, and both were extremely drunk. The screaming and hair-pulling started in the very full restaurant.
A truly shitious moment in my life.