I couldn't give tewshits

adj.

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To care. Generally used in the negative as in "I couldn't give tewshits"

In use

Johnny: "Wally's gone off with yer lack boy!" Mikey: "I couldn't give tewshits boy, she's owny a baythur anyways!"

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

Pleasure to see you, as always. Would you like me to translate 'I couldn't give tewshits' in use for you?

'Wally has run off with your lady friend, old boy!' 'I could not care less, she was rather unbecoming in any case!'