when a guy, could be several to many, cums in a girls mouth, then is exchanged (spit,dribbled or bukaki) into another girls mouth going back and forth till one of the girls swallows it all.
or...
when a man or men cum inside a guys ass then is sucked out by another then swallowed.
Luther bukaki'ed Aretha with such verve that her face was slathered in the thick, chocolaty defecant and Luther's o-ring was stretched like salt water taffy left out on a hot summer day.