A couple of expressions which I've seen in Slovak are nonstop (=open 24hrs) and dres (=a footballer's jersey). My family name sounds like a vulgar word in Slovak, too. I won't tell the whole story of how I found that out, but just imagine a long, deathly silence followed by gales of laughter. O_o
I also discovered, mid-lesson, that žiadný čas (no time) sounds like жадный час to Russian ears: "greedy o'clock"?! :D