This is a clip from 1944 of the Ross Sisters. If you listen to the words in the song, you can pick up the slang that young people were using back then. Where we have been saying "cool" from my generation, and it's still a word today, but has been replaced by "awesome", plus a few others of today's generation. Back in 1944, seems that the big buzz word was "solid", as in "solid jack"! After their song, watch the dance part of the act. I think they'd win Americas Got Talent today.
YouTube - Ross sisters - Solid Potato Salad (VHS quality)
YouTube - Ross sisters - Solid Potato Salad (VHS quality)