The act of a guy jerking off into his bellybutton, sprinkling in oregano, then scooping the mixture into a shot glass to drink it once it becomes room temperature
"Last night I was hungry AND horny, so I made some oyster soup."
Licking and sucking on a clitoris to make a woman very hot and very wet.
His tongue-flicking and persistent sucking made her engorged clit stand out like an oyster in a delicious, fragrant, steaming cup of liquid. He was making oyster soup.