Is Polglish a threat?

I don't know but if you listen to
 German rock bands such as The Scorpions, they mixed UK/US English with a Hannover accent
and came out with one of the classic lines in music, 'Bad boys vunning vild, und you bedder
 get of ze vay' rather than sounding threatening, it sounded like some 60 something deck chair attendant.

One Polish guy said he was going to 'punch this guy, right on the nose' I think he learned English from
Noel Coward and Rambo but obviously, he didn't see any difference, so yes, mixing lingo is a bit dodgy.