scurrilous adj.

"given to the use of low and indecent language," "using such language as only the licence of a buffoon can warrant" [Johnson], 1570s, from scurrile "coarsely joking" (implied in scurrility), from Latin scurrilis "buffoon-like," from scurra "fashionable city idler, man-about-town," later "buffoon." According to Klein's sources, "an Etruscan loan-word." Related: Scurrilously; scurrilousness. As a verb, scurrilize was tried (c. 1600).