I just learned my favourite Korean word so far. My Advanced students just taught me "boorul chingu" - testicle friend. It means a friend you have had since boyhood. Korean parents apparently used to let their children run around without pants, as diapers were too much trouble, so the term means soemone you were friends with when you were allowed to let it all hang out. Apparently they sometimes also wore crotchless pants - what a country.

My students also informed me that Bill Gates is dead, which turns out to be incorrect. Crazy Koreans.