Wiktionary
waste of space
n. An utterly worthless person, one unworthy of the space which they occupy.
Usage examples of "waste of space".
As she dug her way toward the bottom, Ryld thought he heard the high priestess mutter something disparaging about the ambassador and a comment about her being a waste of space then her face brightened as she pulled a thick tube free.
Way I feel, would start with a nice big rock smack on Agra--a bloke there who is a waste of space.
Way I feel, would start with a nice big rock smack on Agraa bloke there who is a waste of space.
They did not seem like furious great suns strewn through a waste of space.