Listen to the song here. The Foggy Mountain Boys was an American bluegrass band. The band was founded by guitarist Lester Flatt and banjo player Earl Scruggs. The group is considered one of the premier bluegrass groups in the history of the genre.
It probably means nothing. Yellow is the color we expect urine to be. If you take a vitamin supplement, these can sometimes give the urine an almost fluorescent color, a very bright yellow or yellow-green.
Using certain medications and vitamin supplements, such as B-complex vitamins, can make urine a bright yellow color, according to WebMD. The color of urine typically depends on the concentration of the yellow pigment called urochrome.