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When a Brit who is abysmally clueless and oblivious about all things Irish explains pompously and condescendingly to an Irish person about his or her own country's history and geography, in a way which only serves to highlight the Brit's total ignorance. Named after the black and tan militia.
Boris: "Look, you're part of the British Isles, which means you are a British Isle, not a separate country, you belong to us and you really should know your place."

Pat: "Nice tansplaining, Boris."
by Bdelygmia November 07, 2019
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