Ten Dollar Kush. TDK is any kind of really dank kush one can easily afford it is also any quantity of kush sold or bought strictly for ten dollars.
On the street in Socal it is often used as a substitute for weed, pot, marijuana, bud, dope, herb, etc...
"Gimmie soma dat TDK"
"Lets toke it where that TDK at?"
"shit, is that a quad of TDK?"