Jagoff

Jagoff or jag-off or the abbreviation jag 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 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, evoking feelings of delight among Pittsburgh expatriates. Despite the term's phonetic resemblance to jack off, the two possibly have different origins and jagoff, while derogatory or playful, is generally not seen as obscene among Pittsburghers and Chicagoans.