There are certain words that are used consistently incorrectly by my students, over three contracts at three different schools, which seems to suggest that someone, somewhere is teaching this stuff.
Trash is used in place of throw out, litter, and trashcan (sometimes all in the same sentence.) Interestingly, while my students are against littering as a concept, littering in Korea is not a tut-tut occassion or a fineable offense.
It's an actual occupation. People are (presumably) paid to wander around the streets throwing adverts on the ground at random. This is particularly done by the sorts of places with names like "Sexy Bar & Rooms".