clarty adjective1 •(dialect, UK) Sticky and foul; dirty, filthy, muddy.CLART. To spread, smear, or daub. A flake of snow, when it is large and sticks to the clothes, is called a clart. So we have clarts, mud; clarty, muddy, sticky. Clarty-paps, a dirty sloven of a wife. — 1846 formsclartier · clartiest