"Løs" is the norwegian word for "loose", it is also being used to describe a person that is promiscious, and has sex with almost anyone. In addition to this it can describe an object that is unsteadily, loosely attached to something or someone...
Hun/han er så forbanna løs!!!
She/he is fucking promiscious!!!
Ballen faller løst igjennom luften
The ball is falling loosely through the air