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1) Unteachable or untrainable

2) Cant see the obvious if it bit them on the arse

3) Someone who, by their very existence, are proof positive that information CANNOT be absorbed by osmossis. See THICK AS TWO SHORT PLANKS.

3) George W. Bush
George(W)Bush is as thick as pig shit.
by sociopath9 May 02, 2009
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2
A person who is unteachable. Wouldn't be able to learn if it saved their life.
Girl: (after having a fit and insulting a guy): Learn to appreciate girls and then maybe we can try again.
Guy: If you think I will ever try again with you, you're as thick as pig shit.

Donald Trump is as thick as pig shit.
by DarthKieduss September 28, 2018
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