Utterly intoxicated (usually drunk). When speaker is shithoused, word can be used as virtually every form of speech.

Getting home from a long night of drinking only to have your parents waiting at home to give you shit when you get back.

What really drunk people confuse with "shitfaced".

The state of being intoxicated way past shitty or shit faced. So drunk the house is moving!

Very drunk/pissed,to the point that you might need to spend the night near the toilet/outhouse or a bucket/bin.