Definition & Meaning of "jagoff"in English

What is the origin of the term "jagoff" and how is it used?

"Jagoff" is American slang strongly associated with the Pittsburgh region and dates to the 20th century. It likely derives from "jag," meaning to poke or annoy, combined with a crude suffix influenced by sexual slang. It came to mean a detestable, annoying, or foolish person. The term is used in informal speech, especially regionally. It is vulgar and derogatory.