This is the 118th most frequent Lithuanian word.
ko
"Ko" in Lithuanian means "of what," "what," or "why" depending on context.
Here, 'ko' is used in the genitive case form of 'kas' (what), indicating a direct object in a querying manner.
Ko tu nori?
What do you want?
'Ko' is used in conjunction with 'nors' to mean 'something' in a genitive form, often implying an indefinite reference.
Mes ieškome ko nors ypatingo.
We are looking for something special.
In this sentence, 'ko' incorporates a genitive relationship with an understood or referenced item in the question structure.