This is the 31st most frequent Slovenian word.
nekaj
"Something."
Here, 'nekaj' means something (indefinite item or concept), used as a general reference to an unspecified item.
Želim nekaj za kosilo.
I want something for lunch.
In this sentence, 'nekaj' refers to an unspecified thing or situation causing the bother.
Nekaj te moti.
Something is bothering you.
In this case, 'nekaj' denotes a certain amount of time, indicating some extent but not precisely defined.