Is the abbreviation of the phrase "Que la famille" which means "Only the family". Comes from the french rap group PNL and means that you would do anything for your family and friends and don't care about other people.
"QLF ne cherche pas d'alliés" from: PNL - Onizuka
It means "QLF don't look for allies"
A nickname, porte-manteaux for Crim and Timothy.
Usually a guy with a baby face, coffee-colored skin, frizzy hair and a Nike cap who's not too bad at Gears of War.