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.
Turbidity and other terms are used to characterize the appearance of a urine specimen. Urine may contain red or white blood cells, bacteria, fat, or chyle and may reflect renal or urinary tract infection. Some drugs can change the color of the urine. Normal urine color is a light yellow to a dark amber color. Inflammation may also cloud the urine as well as other pathological conditions can. Dorban can color the urine red; phenolphthalein can color it red; pyridium can color the urine dark orange.