Irish saying. Describes something which is completely useless and valueless. Alternatively, can be used to describe a completely incompetent person. To Irish people, this phrase is used to refer to something which is below even the value of feces. In other words, the worst level of uselessness something can possibly reach.
My lawnmower isn't worth a shite!

Tom: Jesus Christ, how are we after losing 8-0 again?
Joe: Face it Tom, Paddy's not worth a shite in goal. He's as likely to save anything as he is giving up the drink.
by Jotinmick April 18, 2018
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