yes, I know cpod is all about giving us realistic dialogue, and I have no reason to doubt that.  But in this case, I'd like to know straight from the experts. If there are any Chinese kids in that 13-18 year age group on this site, let me know your thoughts.  And if i hear that it's something like "tài hǎo le", i'm going to be really disappointed.

At least in the States, the kids said stuff like "cool" and "tight".  My one American based expert in this area moved out of the house awhile ago, so I know longer know what American kids say for "cool".