>czy wyrazenie" freak a leak" to idiom? jak to sie tlumaczy?
No idiom; just a lump of louche language; means 'fuck a hole'.
A freak-a-leak (a freakaleak) = a guy that fucks a lot.
You can build your own names freely:
Mr Knowitall (a fucking genius)
Mr Mixalot (a prolific DJ)
Mr Lancealot (a busy lancer :))
Mr Fuckalot (Mr Fuckahole, Mr Lickapussy, Mr Freakaleak - sexoholics, porn stars, casanovas..., guys..; who knows)
Ms Fuckmehard (a prodding lady ;))
..and so on.