Jagoff or jag-off is an American English derogatory slang term from Pittsburghese meaning a person who is a jerk, stupid or inept. It is most prominent in the Pittsburgh area and Pennsylvania in general, along with wide use in the City of Chicago, particularly in the Irish taverns. The Dictionary of American Regional English defines the term as a "general term of disparagement". It is an archetypical Pittsburgh word, conjuring feelings of delight among Pittsburgh expatriates.