Ever been in a crowded place (like an airport) and a few Korean people are right next to you just talking away? You may be able to pick up a few things (especially after you keep visiting this part of the forum ) and you could swear that they are talking trash about you. OK! So...if you are absolutely 100% positive these guys are talking trash about you, you can shock them by turning around and saying:

"YAH! GOO MAHN YOHK HAE RAH!"
(The "GOO" is pronounced as "good" without the D at the end; the "YAH" is prounounced like "Yes" in Deutsch or German)

I can't get the exact translation of this phrase... but the expression (informal, BTW) means something like:

"HEY! QUIT TALKING TRASH (about or to me)!"

4 out of 5 times, they are stunned in silence...you can just strut away from that point.

That's a good one. Can you add a "Biaaatch" in Korean at the end of it?

HEHE! Try this on for size:
"GOO MAHN YOHK HAE, EE SHEE BENG AH!"

I have no clue what it means, though. I just know it's a curse made up by the kids like the sense of the "Biyyaaatch!" term; thus, it won't appear in any Korean-American dictionary.