(Translates to "fun and useful to have a 'secret language')jätte kul och användbär att har en lite "hemlig språk"
Actually, this fact was used by the americans around the pacific during the second world war. They recruited navajo indians who translated various messages to their native language (using metaphors like "big metal bird" for planes and so forth).
A very good idea, but you need to make sure it's a unknown language.. And that there aren't any translators on the internet

-- Christer