Next time you're traveling or just chattin' in Korean 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 Korean teaches the casual expressions heard every day on the streets of Korea:

-What's up? Wasseo?

-Holy shit, I'm trashed. Ssibal, na manchiwi.

-I gotta piss. Na swi ssayahae.

-Who farted? Bangu nuga ggyeosseo?...