In Baltimore, in the mid 1800's there was a man who sold corpses to the hospital for research. He stored the cadavers in cheap whiskey to ferment them before turning them over to the researchers. He then sold the whiskey to the medical students thus the term "rot gut".
Before thermometers were invented, brewers would dip a thumb or finger into the mix to find the right temperature for adding yeast. Too cold, and the yeast wouldn't grow. Too hot, and the yeast would die. This thumb in the beer is where we get the phrase "rule of
After consuming a bucket or two of vibrant brews they called aul, or ale, the Vikings would head fearlessly into battle often without armor or even shirts. In fact, the term "berserk" means "bare shirt" in Norse, and eventually took on the meaning of their wild battles.
In 1740, Admiral Vernon of the British fleet decided to water down the Navy's rum. Needless to say, the sailors weren't too pleased and called Admiral Vernon, Old Grog, after the stiff wool grogram coats he wore. The term "grog" soon began to mean the watered down drink itself. When you were drunk on this grog, you were "groggy", a word still in use today.
Many years ago in England, pub frequenters had a whistle baked into the rim or handle of their ceramic cups. When they needed a refill, they used the whistle to get some service. "Wet your whistle," is the phrase inspired by this practice.