Well, I’m mystified. I grew up reading American comics and knew most major US slang words (which have probably changed a lot by now) but I stumbled across an American site called The Best Of British, dedicated to British words, and found myself a bit lost. The following words are apparently all still in use here…
The bee’s knees
Box your ears
Grem (to spit)
Perhaps this isn’t a slang dictionary at all but a guide to films of the 1950s. Be honest, when was the last time someone told you they were tickety boo? And as for rumpy pumpy…
Of course, the site’s a bit of fun, but I do wonder if American still think we all wear bowler hats (they always seem to feature on the covers of my US editions). Oddly, the one place where you still hear these words occasionally is India!