Did you know I always thought the reference was to wild pigs? When I read this, my first instinct was to correct you, but then I realized, “wait a second, the adjective is spelled ‘boorish.’”
(Also realizing another “grammar nazi” thing I don’t know: Where do I stick that last period after ‘boorish’? I blame that on reading too much British literature, because I know their rules are different.)
‘.
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Also, given that Yeltsin was an obnoxious drunk, you could spell it “Boris” and pronounce it “Boorish.” :-)