Ogre Backwash is old slang for the warmish dregs of beer swirling around the bottom of, originally, a quart or, later, 40oz beer bottle being shared among friends. Typically involves high school and college age folks in informal setting drinking straight from the snout. The last few ounces would be lukewarm, flat and mixed with saliva backwashed from each mouth. Sometimes it's inadvertent and sometimes not. You have to know the personal habits of your friends and keep an eye out for anyone rinsing their teeth. Ogre? Only an Ogre would really like it. I just like the way it sounds.
