Going to Tallinn for almost a year - give me all the slang, idioms, colloquialisms and phrases you've got!

I'll be volunteering there for a year so I'm learning Estonian but you can't learn everything from a textbook... Plus everyone knows that swear words are the most important part of any language.

EDIT: I'll be in Tallinn and I'll be working in a school, a youth centre, possibly a summer camp too. Basically different types of childcare.