This is not slang. It is Dutch for "scrotum."
In the Netherlands, the pouch of skin and muscle that contains the testicles is called the balzak.
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slang pronunciation of ball sack, or the scrotum, where your one, two, or three testicles tend to hang out, though usually in pairs of two.
I slapped her in the face with my balzak
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Balzak is a kind word to describe your friend. It is mostly used in the dutch language.
Me: 'Sup dude?
Justin Bieber: Fuck off, kanker balzak! I don't even know you.
Flinn: Hey Robbe
Robbe: Laure balzak
Flinn: ...