A booty call that requires very little effort or work to obtain it, especially in the current time.
Guy 1: Dude I can't believe you hooked up with that girl. You must have worked your ass off for the last couple months for that!
Guy 2: Naw it's a girl that I used to hit on all the time at one of my old jobs and now it's paying dividends. It was a residual booty call!