Describes someone who is listless, lacks energy, or has no appetite. It refers to a person who seems drained, unmotivated, or totally lazy. (It is the colloquial pronunciation of desganado, dropping the d).
Son, why are you so desganao today? / Here, have some soup so you stop being so desganao.
To slack off, loaf around, or waste time due to laziness, apathy, or a lack of drive. It is a synonym for the Venezuelan expression echar el carro (to shirk work or responsibilities).
Stop your vagar because you have many exams. / This guy does nothing but vagar, what a drag.