Slang, n. The speech of one who utters with his tongue what he thinks with his ear, and feels the pride of a creator in accomplishing the feat of a parrot. A means (under Providence) of setting up as a wit without a capital of sense.
All slang is metaphor, and all metaphor is poetry.
Correct English is the slang of prigs who write history and essays. And the strongest slang of all is the slang of poets.
Slang in a woman’s mouth is not obscene, it only sounds so.