me: hey marsha, wanna grab some 5th meal tonight?  marsha: ok, i'm totally ok with it
after 4th meal is purchased at your local taco bell, you go back to your place with a female companion and proceed consume 4th meal
"me: hey marsha, wanna grab some 5th meal tonight?  marsha: ok, i'm totally ok with it" What is the definition of "5th meal"?