This is the 1854th most frequent Swedish word.
killar
"Boys" or "guys."
In this sentence, 'killar' is used to refer to a group of boys, and 'killarnas' is the possessive form meaning 'the boys'.
Killarnas lag vann turneringen.
The boys' team won the tournament.
Here, 'killar' is used to refer to unspecified boys observed playing soccer.
Jag såg några killar spela fotboll i parken.
I saw some boys playing soccer in the park.
In this use, 'killar' functions as a direct address term to call upon boys present.