Public sitter Share definition Flag A person who doesn't use a toilet seat protector or toilet paper to line the toilet seat in a public restroom. Guy: Dude, I just found out that Matt is a public sitter! Girl: Eww, gross! Public sitter by Comment Poster June 16, 2008 0 0 Get merch Get the Public sitter mug. Buy Now — $32.95 See more merch