eat a cactus - A super harsh way to tell someone you hope they rot in hell

A super harsh way to tell someone you hope they rot in hell and never see the light of day again

My cousin said 'eat a cactus' when I stole his last burger and his pet goldfish died.

My ex texted me 'eat a cactus' after I posted a photo of her with a mustache on.

My teacher said 'eat a cactus' when I drew a fart on the principal's face.