Secret racist code words
Of course, of course! I should have known the mayor of New York was only mad about the transit strike because he's a racist! Thankfully, this open letter helped me understand.
I'd have figured it out sooner, except that somewhere, somehow, I clearly missed some important linguistic expansion. No doubt everybody but me knows that "thug" is a secret racist code word.
Main Entry: thug
Etymology: Hindi thag, literally, thief: a brutal ruffian or assassin
(Hat tip: majikthise)