Speak Japanese - When you see a friend
"genki?"
translation: what's up?
"genki!" or "genkidayo"
translation: yah I'm fine/cool
"mecha kucha tsukareteru"
translation: I'm really tired
"cho-" or "mecha kucha" or "mecha"
translation: really
"kinou nanishita?"
translation: what did you do yesterday?
"sokka"
translation: oh...
"tanoshiso-jyan"
translation: sounds fun!
"tsumanne-" (for guy) "tsumannai-" (for girl)
translation: this sucks/is so boring
"tsuman nasaso-"
translation: that sounds boring
"sugoi!" or "suge-" (for guy)
translation: WOW! (that's cool!)