fag

Fag is mainly used as an offensive term for homosexuals. Although it has other meanings, you should probably avoid it at all costs.

This is a very strong word that should be avoided in nearly all situations: fag (short for faggot) is a hateful slur against homosexuals. It's as bad an insult as nigger and cunt. Because fag is such an offensive word, the other meanings are uncommon, but fagging has also meant working hard and getting tired, as in fagging out. A fag — especially in England — is also a cigarette, and in British boys’ schools, fags are servants for older boys.