person 1-hey, get that tissue over there person 2-eww, its been used 1-use a back-up tissue 2-whatever, *mumbles*
a second tissue used to pick up an original tissue used by yourself, or someone else
"person 1-hey, get that tissue over there person 2-eww, its been used 1-use a back-up tissue 2-whatever, *mumbles*" What is the definition of "back-up tissue"?