How to drink water

Its easy okey , i will teach u how to drink water with hand .Pour some water to the cup , mug , bowl and other . Grab taht cup with your hand okey and move that cup to your lips . after finishing placing the tip of the cup on the lips. you need to raise your hands up, make sure the water in the cup goes into your mouth. drink slowly. how do we drink water

Sometimes used as defining, "how do you do this" or being a stupid idiot actually not knowing how to drink water.
Sometimes even used for defining a person, or you is dumb.