During my tenure in the 39th Signal Battalion at Schinnen in The Netherlands north of Maastricht my Dutch colleagues used to say that Klot Soc literally meant someone who sits on their balls doing nothing a lazy SOB if you will.
... if Wilder’s manages to get elected it’s going to turn Holland on its head.
They said Kloot Sack. Only sounds like klot sac.
Meaning is scrotum. Many ways the term is used in the Netherlands and by some Flemish. It can mean tits on a boar. It can mean ahole. It can mean many things in context. One of my Grandparents nicknames for some neighbors was that.