Neues Wort auf Bulgarisch

It’s “аджеба”. The word is a colloquial particle in Bulgarian, used to express wonder, doubt, or surprise, similar to “actually,” “really,” or “how curious” in English.

It originates from Ottoman Turkish “acaba”, meaning “perhaps” or “is it so?” and retains similar connotations of uncertainty or amazement.

https://en.wiktionary.org/wiki/%D0%B0%D0%B4%D0%B6%D0%B5%D0%B1%D0%B0