Concept invented by Finnish magazine called "City", means its something worth to check. It means "Tsekkaa jos et usko" In Finnish, roughly translated "Check it out, if you don't believe".

Someone who used to be a potential girlfriend/boyfriend, but no longer is.

Tjeu - Tuh-jew - noun - A slang term describing a ‘crush’ or attraction from a female to either a celebrity icon, media figure, or character from a book or television program who is male. (Plural: tjeued)

Unknown origin, used in Finland for something good, for example in a HOT/NOT list, the HOT may be replaced with a "tjeu". Probable swedish origin?