Serbian. Morphologically this is short for "jebao te" = past tense of the transitive verb jebati, 3rd person singular, with te = you as the direct object. Thus, literally: he fucked you, or idiomatically: may you be fucked. In usage, this is a universal expletive expressing great impression or strong experience. It is not pejorative. A plausible link between the usage meaning and the origin is: "so intense that you (one) may get fucked". The closest English expression would be "Shit man!"