A german word for when the apocalypse is happening, your gf/bf broke up with you or there is no bread in the house. The english equivalent would be "sometimes it do be like that"
Ex 1: I'm gonna make a sandwich - ok - wait, there's no bread! - tja
Ex 2: Berlin has fallen - the sowjets took it and burnt it to the ground - *moment of silence* - tja
I don't know about the German, but in the Swedish language it is another way to say hi, used by people that know eachother, and mostly used in the teens