Slang is one of my hobbies. It is interesting that here in the US, from the mid-to-late 1800s onward, I determined most slang could be categorized as originating from black musicians (50%), black criminals, hipsters, and hustlers (25%), and itinerant whites of "dubious" social standing (original hipsters/Beats, hoboes, tramps, con artists, pro gamblers, criminals, carnies/circus folk, and to a degree, non-career military folk) (25%).
After 1980 or so, you got the percentages changed, as some of the old talk from the latter category was replaced with "white" subculture/counterculture slangs (eg. skateboards/surfing/BMX, hacking/computing, etc.).
"Drop it like it's hot"
Pimp talk. The whole phrase is "Drop my money like it's hot, so I can pick it up, like it's not." or so.
"The game is to be sold, not told"
Pimp talk