Old 1930's slang for homosexual. See it for yourself in a movie called "Life" Eddie Murphy and Martin Larwence. Bernie Mac plays the homosexual and his nickname is ....you guessed it....
Nick name for a fellow that is well endowed..........if you know what I mean. Meaning that it's so long, it sounds like a large chain when pulling it out.
She called me Frank till she saw me naked, now she calls me jangalang.