A 1930s slang term, meaning to smoke opium.
"He took her down to Chinatown/ And he showed her how to kick the gong around" -Cab Calloway "Minnie the Moocher"
1. To kick the gong: To smoke opium (from Chinese opium dens of the last century where customers struck a gong to make the attendant come and bring them a pipe).
2. To mastubate (if you're male).
1. Lyrics from "Minnie The Moocher" (30's jazz hit for Cab Calloway):
She messed around with a bloke named Smokie
She loved him though he was cokey
He took her down to Chinatown
And showed her how to kick the gong around
2. She gave me such a case of blue balls last night I couldn't wait to get home to kick the gong.