This is the 6875th most frequent Swedish word.
oskar
"Oskar" is a Swedish male given name.
Here, "Oskar" is used as a proper noun, likely referencing a person's name.
Oskar sjunger en sång.
Oskar is singing a song.
In this context, "oskar" might be a mistaken spelling or refers to an object colloquially named 'oskar', warranting clarification from the speaker.
Det är märkligt att oskar inte fungerar längre.
It's strange that the extender doesn't work anymore.
Here, "oskar" is used in connection with a possessive form, implying that help is needed from the person named Oskar.