fag

Concise Oxford English Dictionary © 2008 Oxford University Press:
fag1 Brit.

▶noun

• 1 informal a tiring or unwelcome task.

• 2 a junior pupil at a public school who does minor chores for a senior pupil.

▶verb (fags, fagging, fagged)

• 1 informal work hard.

• 2 (of a public-school pupil) act as a fag.

• 3 (as adj. fagged out) informal, chiefly Brit. exhausted.

– origin C16 (in the sense ‘grow weary’): of unknown origin; cf. flag4.

Concise Oxford English Dictionary © 2008 Oxford University Press:
fag2

▶noun N. Amer. informal, derogatory a male homosexual.

– derivatives
faggy adjective.

– origin 1920s: short for faggot (sense 3 of the noun).

Concise Oxford English Dictionary © 2008 Oxford University Press:
fag3

▶noun Brit. informal a cigarette.

– origin C19: elliptically from fag end.