"To load the dishwasher" means putting dirty dishes, glasses, and utensils into the machine so that it can clean them for you automatically. Full definition
He was also obsessive about doing little things his way — like loading the dishwasher. (moneysense.ca)
My lease doesn't state anything along the lines of loading the dishwasher with a «full» or «reasonable» load. (biggerpockets.com)
For example, have a contest to see who can pick up the most toys in the living room or make loading the dishwasher a puzzle game. (freeprintablebehaviorcharts.com)