From Bob Dearborn's The Olde Disc Jockey's Almanac this morning...
"December 1, 1972…Wings released "Hi, Hi, Hi." The BBC banned the song for its supposedly suggestive lyrics and because of their assumption that the title phrase, "We're gonna get hi, hi, hi," was a drug reference. The sexual line the Beeb objected to is the one they heard as "get you ready for my body gun." McCartney has said the correct lyrics are "get you ready for my polygon," an abstract image."
As for the word "polygon," give me a break, Paul. Listen to it in context. There's no way that is supposed to be an abstract image. Of course, all these years later, it seems pretty tame anyway. It would never be banned today. Here's the song...