Dog Soup [noun]: Rain water.
Torrents of rain assaulted the draught-stricken land. The dog soup saturated the soil quick, then sat puddling on its surface.
As always, try and use this word, either in its direct definition, or in an altered state; then come back and let me know.
Kacirk, Jeffrey. The Word Museum: The Most Remarkable English Ever Forgotten. New York: Simon & Schuster, 2000. 59. Print.