I love my American Slang!

1. geek or coward: "naknik" (hotdog) or "shloimale" (it's a name..)

2. ok: "sababa" or "achla"

3. in the army they say "chiuvi" (yes) and "shlili" (no)

4. enthusiast: "af" (fly) or "chash" ex:"ma ata af al atsmecha?" 

5. it's good: "mashu mashu" (something something)

we also use  arabic words in slang:

1. when you want to start or to hurry someone: "yala"

2. i dont no: "ana aref??"