Ever since the September 2009 TF2
update, players, who supposedly did not use a 3rd party program to receive random item drops, has gotten a hat representing an angelic halo.
This term, halo, is now used to refer those with halos, fags.
TF2 Player 1: My god, that guy is such a halo.
TF2 Player 2: Halos need not healing.