Guyer

n.

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Useless dog. Person of poor character. As Gaeilge, gadhar.

In use

De bollix dat stole me fone is some guyer

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

Hello, you marvellous creature. Would you like me to translate 'Guyer' in use for you?

The scoundrel who stole my telephone is a thoroughly worthless cur.