thick slippery mud, or gumbo, found in the creek valleys of the B.C. interior.
See also: slum
- 1952  (1958)  Ah Bau was a Chinese who panned for gold in that same slippery mud called Cariboo Slum that was to plague two generations of railroad builders who followed him.
- 1958  Despite the dread "Cariboo slum" which bedevilled miners on Lightning Creek, some $13,000,000 was taken from it.