The sexual act of defacating into your partners anus either directly or using some form of tubing. Originated by a sexual pioneer named Rob and his dear mother.
The woman cleaned the shit off her ass after getting a Rob-job.
The sexual act of one man giving oral sex to a man while rotating in circles.
Guy 1: Your brother gave me a Rob-Job last night, it was amazing.
Guy 2: I always knew he was gay.