The phenomenon of throwing up where the puke is extra thick and chunky and the resulting puddle holds itself together in a thick round patty shape. Can often happen after a big session of eating and drinking.
Man, I felt so bad after downing all that pizza and beer but after I laid down a stomach patty on the neighbour's lawn I was good to go!
Mike: "Damn I shouldn't have had that last plate of chicken wings."
Ali: "Stop your whining and lay a stomach patty in the alley over there. I wanna hit that bar up the street."