Andrés,
It is difficult to understand some of the slang that Americans use. But what better way is there to learn it, than to have it said out here, amongst friends?
Heck! Even people from the UK and the US have problems understanding each other's slang at times, so we all have the same situation.
I'm still trying to figure out why an elevator is called a lift, and a baby buggy a pram -
Those Englishmen! You'd think they invented the language, not Americans -
Wolf (Who's totally illiterate when it comes to Spanish.
)