Say what? A glossary of teen slang: for confused parents, a guide to what your kids are really saying. But hurry ... they'll be on to something new before you know it.(Family)(Glossary)

BF, GF (abbrs., boyfriend, girlfriend) "My friends and I use it online when we're talking about who's going out with who. It's faster--I wouldn't even think of typing the full word anymore."--Michelle, 15, Stillwater, MN

BF4L (abbr., best friends for life) "It's how we sign off instant messenger. And we'll say it to clear things up if we've had a fight."--Josie, 14, Carmel, CA

Busted (adj., ugly) "Sometimes I'll be walking down the hall and H1 hear someone say 'Ew, that girl's busted.' It's pretty mean, and people shouldn't say it."--Danielle, 14, Louisville, KY

Cheddar (n., cash) "I've heard it said like, 'I need some cheddar to buy this new video…