When your masturbating in the kitchen and accidentally spill olive oil on your penis, however the sensation keeps you going and gives you the urge to prepare a lasagne
Guy 1: "So I was in the kitchen just beating one out before making my girl dinner, then suddenly BOOM!!! Got olive oil on my dick."
Guy 2: "So what did you do?"
Guy 1: "I said Mama Mia that's a good shit! Finished. Made my girl a lasagne"
Guy 2: Ah The Italian Job. Classic.
Opposite of a Bag Job. Implying that the person in question has an attractive face, but with a very unattractive body, and so in order the sleep with the girl, a sleeping bag must be used to cover up the body and complete intercourse.