Space cheese

"Okay, who cut the space cheese? Chewie, was that you?"

- Han Solo

Space cheese was cheese... IN SPAAAAAACE!

Well, yes and no. It was most often used as a euphemism for flatulence, as some brands of cheese produced aboard space stations, when sliced, effluxed a rather powerful and not entirely pleasant odor. Han Solo often tried to blame Chewbacca for his own dairy emissions, which were made worse by the fact that he was lactose intolerant.