You’ll most often hear people talk about how they’re going to enjoy a dram of Scotch or pour themselves a wee dram, which is a unit of measure not often used in the United States.
It usually refers to a “small amount” but it actually has a definition according to the U.S. Customary System.
A US fluid dram is an eighth of a fluid ounce, 60 min (that’s short for minim, which is about a drop) or around 3.7 mL of liquid.
It is actually smaller than a teaspoon, which is measured as 80 min, so chances are someone is pouring themselves several drams of whisky. 🙂