Shytarse

n.

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A person with whom someone is totally dissatisfied.

In use

Yer man is some shytarse for aytin' every last wan of de crusty blaas.

Let Lawrence Muck translate it to posh English for you
Lawrence Muck

Oh, hello! I didn't see you come in. Would you like me to translate 'Shytarse' in use for you?

That gentleman is an absolute rotter for devouring every last crusty blaa.