A tiring or unwelcome task. Cleaning the entire house by myself was such a fag.
A junior student at a British public school who is required to perform certain duties for a senior student. As a first-year student, he was assigned as a fag to one of the seniors.
Chiefly British, informal: a cigarette. He popped outside for a quick fag during the break.
Slang, offensive: a homosexual man. The word "fag" is an offensive slur for a gay man and should be avoided.