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1.
The feeling of not feeling so good. Feeling shitty but with a more sophisticated expression.
After eating that McDirty Burger, Tom is feeling quite shitious.
by Paul H. October 25, 2007
 
2.
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.
by Congo Bob January 10, 2010