The act of inserting a man or woman's finger (preferably their smallest one) or toe inside a man's peehole, or the hole that is found at the tip of a man's penis. This is often described as both painful and pleasurable, and has been known to severely disfigures the man's penis.
John: Aw, man my penis hurts. She game me an Italian Fingerjob and I'm a bit sore.
"Yo, Frankie! Did you get a look at that broad? I know you'd like to Italian roast her someday, am I fuckin' right?"
"Nah, sausage head, not with your garlic breath. Why don't you go shave your fuckin' back before coming on to me. At least take me out for cannoli first."