Easy way to ask a female if she is "d" or ready to perform "rj", which is an oral sexual pleasure upon the anus and rectum of the male receiving the "rj". This is an incredibly easy 6 letter sentence most commonly used by the Los Angeles underground youth in the early 20th century.
Boy: (Just hit with a text letting him know she's home alone) Whatsgood bitch.
Girl: Nothing, just hanging.
Boy: R u d 4 rj?
Girl: Of course not, who do you think I am, Dylan Schapiro?