Rough or ill-mannered in behavior; lacking refinement or social grace.
From 'boor' (a rude or ill-mannered person), from Dutch 'boer' meaning 'farmer' or 'peasant.' The word reflects historical class prejudices, suggesting that rural people lacked the refinement of urban dwellers.
A 'boor' is basically a 'bore' who's also rude! Think of someone who's not just boring but actively obnoxious — talking loudly, interrupting, being crude. The 'boar' connection works too: wild, unrefined behavior.
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