Scurrilous \SKUR-uh-luhs\ , adjective;
1. Grossly or obscenely abusive
2. Characterized by or using low buffoonery
The origin of scurrilous is French scurrile ("coarsly joking") and it was first attested in the 1570's. Scurrile comes from Latin scurrilis ("buffoonlike") from scurra ("fashionable city idler," later "buffoon").
Today's word and the first definition were both taken from Dictionary.com's 'Word of the Day' for Sunday, April 17
Etymologies come from the Oxford English Dictionary and/or Etymonline.com