A word used by member of staff in Subway or sandwich artists used as a timesaving substitute for "Would you like Cheese on your sandwich, sir? Would you like me to heat it up in the toaster for you?"
When a guy is making a sandwich for his lady friend(which rarely happens) and he has no cheese for the sandwich. What he does at this point is ejaculate onto the bread, using his"jizz" as cheese.
Guy:"Honey this is a once in a life time opportunity, I'm making you a sandwich, what do you want on it?"
Girl:"I don't care babe but I want it to be CHEESE-TASTIC!"