This is the 887th most frequent Slovenian word.
npu
It seems "npu" is not a standard Slovenian word. Could it be a typo or abbreviation?
'npu' does not seem to be a word in Slovenian. 'Na poti' translates to 'On the way', but it's unrelated to 'npu'.
Na poti do šole sem videl zanimivo knjigarno.
On the way to school, I saw an interesting bookstore.
The word 'npu' is not present. Perhaps you meant the word 'napisal' which means 'I wrote'.
Napisal sem esej za šolo.
I wrote an essay for school.
Here, 'npu' is used as is without an established Slovenian meaning, causing the speaker to inquire about its significance.