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I'm gonna tan your hide 

It means someone is going to give someone else a hard spanking probably using a belt or strap. The phrase was used to indicate strong punishment by an authority figure over a child.
"If I catch you drinking or gambling again, I'm gonna tan your hide, young man!"

My Pa would say 'he's gonna tan my hide' if he caught me smoking this pipe.
I'm gonna tan your hide by Old Timer December 23, 2013

You do not have enough brains to tan your own hide

An individual who is so stupid that you could be forgiven for wondering whether they have any brains in their head at all. A total idiot, an imbecile someone who you can’t imagine how they are even functioning.
'You sir, are so stupid that I suspect that you do not have enough brains to tan your own hide'