When someone really doesn't care what you're talking about, so they decide to not listen AT ALL WHATSOEVER, THEN THEY SAY, "Who on earth cares?" and then just stomp away.
"Hey, do you know what a magnetic field is?"
"Who on earth cares?!?!" *Stomps away*
by Spark the girl April 12, 2018
Get the Who on earth cares? mug.