Q: Having been born and raised in Houston and lived 25 years in San Antonio, I’ve often heard the phrase “I gotta talk to a man about a horse” used when a person needs to visit the facilities to relieve themselves. What’s the origin of this saying?Terry Godwin, Canton, GeorgiaA: Euphemisms for urination abound. Consider, for example, taking a leak, powdering the nose, draining the lizard, and straining the potatoes. Or, to spill forth with just a few more, answering nature’s call, emptying the tank, opening the hydrant, pointing Percy at the porcelain, paying the water bill, making room for more beer, making one’s bladder gladder, shaking hands with the vicar, and shaking the dew off one’s lily. “Talking to a man about a horse,” or…