Sour puss

n.

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A sad face, usually found on children who don't get their way!

In use

Get dat sour puss off ye now or I'll knock it off ye!

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

Well, well, well. Who have we here? Would you like me to translate 'Sour puss' in use for you?

Remove that sulky expression from your face at once, or I shall remove it for you!