rolled r's

[docmac]

Can anyone give me some insight into the "rolled r's" that I sometimes hear in japanese. I recently heard them on the beginner podcast S 16 ("it's not good to be king"), where the boss does it a few times. I've heard this before, usually in yakuza or tough guy movies...it seems to be a male thing, generally angry, threatening or tough. Is it associated with any particular dialect? Any help appreciated.
Kind of reminds me of the "getting stuck on a word, sounding like clearing your throat" that I hear in Korean films once in a while (usually right before they hit some subordinate). Oops, sorry, back on track, back on track.
Thanks
docmac

[Outkast]

I've heard that too before. And it was usually with "tough-guy" speech acts.

Something interesting to think about, is that the Japanese "r" is actually always rolled (but once, not twice like the standard Spanish "rr" roll.) Japanese language grammarians would never describe it this way of course, but this is how that long roll you've heard is possible--the speaker is extending the single roll into a double or triple (also done in Spanish for emphasis by Costa Rican or Argentina speakers.)

As for what dialects it is associated with, I'm not sure. The stereotype conception is Kansai-ben, of course, but I can't really say.