Ass tissue, noun
Ass tissue is the bits of paper or tissue on your ass after taking a shit and wiping it with a crappy brand toilet paper. People usually discover they have ass tissue on their ass during showers or baths.
Mother: Johny! Why are there pieces of brown tissue in the bath tub?
Johny: Sorry I had ass tissue since I took a quick dump before taking my bath.
Mother: CLEAN IT UP!!!
Toilet paper being used as tissues.
"Do you have any tissues?"
"No, but we have toilet paper"
"Ok, you mean ass tissues?"
"Yeah"