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pound to a pinch of shit 

UK: A pretty good bet that something is going to happen.

Pound = UK money.
I'll bet you a pound to a pinch of shit that its raining when we get back of holiday.

a pinch of coon shit 

something or someone of very little or no value
"What the hells wrong with that Ralph!! Geez...you know, I don't think that fool's worth a pinch of coon shit!"