To Foost; Giving someone a footjob with poop on your feet.
Generally human or dog feces but is also done with other animals fecal matter.
Person A: shit, i just stepped in dog poo
Person B: Gimme a footjob and foost me please.
Person A: this will be my first time foosting
Person 1: "Hey, Jimmy, whatcha doin'?"
Person 2: "Oh, just havin' some breaaakk foost"