GET D RTY
Next time you're traveling or just chattin' in Japanese with your friends, drop the textbook formality and bust out with expressions they never teach you in school, including:

-Cool slang
-Funny insults
-Explicit sex terms
-Raw swear words

Dirty Japanese teaches the casual expressions heard every day on the streets of Japan:

What's up?
Ossu?

How's it hanging?
Choshi doyo?

I'm smashed.
Beron beron ni nattekita.

I love ginormous...