BF， GF： 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

BF4L： best friends for life

"It's how we sign off （寫結(jié)束語） instant messenger. And we'll say it to clear things up if we've had a fight." —Josie， 14

Busted： adj. ugly

"Sometimes I'll be walking down the hall and I'll hear someone say 'Ew， that girl's busted'. It's pretty mean （刻薄的）， and people shouldn't say it." —Danielle， 14

Cheddar： n. cash

"I've heard it said like， 'I need some cheddar to buy this new video game.'" —Kody， 12

Crunk： adj. awesome

"My friends say it like， 'Dude， you should have been there last night—it was crunk.' It may have started as a combination of crazy and drunk， but now we use it to describe any awesome time." —Billy， 15

MOS， DOS， POS： mom over shoulder， dad over shoulder， parent over shoulder

"Guys will type it if they're talking to a girlfriend online. Maybe they're embarrassed and don't want their parents to know." —Will， 15

Money： adj. cool

"If someone shows you a new jacket and you like it， you can just say， 'Money.'" —Sylvia， 15

Off the chain： cool

"If there was a really fun party， people might say， 'Oh man， that party was off the chain.'" —Scott， 15

Tope： adj. cool

"It's a mixture of the words tight and dope， which both mean 'cool'." —Sylvia， 15

My bad： my mistake

"If I make a bad pass at ball practice， I'll say 'My bad' to a teammate." —Scott， 16