The title of this movie doesn't make a lot of sense, until you see it in operation, because it's the sound that a retarded young man makes while he's operating his imaginary trolley, which is what he does all day. And he is just one of many odd characters in this surreal & at times, tragic tale of a group of slum-dwellers in Japan.
There are two drunks who trade wives, there's a man with aspirations to be a architect, and his young son who he sends out to beg for food. There's a wise old man who seems to be the pillar of sanity within all that goes on around him, and there's a businessman with some severe nervous tics that has a wife that treats him (and everyone else) like dirt.
There's no particular plot to this, really, it's a bunch of stories that drift back & forth between each other, sometimes funny, sometimes tragic. All in all I thought it worked pretty well, & I had been dying to see this for a long time just based on its description. I was not in the least disappointed, and I'd definitely recommend this. 9 out of 10.