A lightweight, two-wheeled vehicle equipped with a small motor and pedals, designed to go no faster than some specified speed limit.
He was drunk again and moped, whining at length about his moped.
Moped meaning : To carry oneself in a depressed, lackadaisical manner; to give oneself up to low spirits; to pout, sulk. To make spiritless and stupid. Melancholic, dejected.