Eat shit and taste it
You use this when you want someone to not just swallow poop, but to be stuck with it forever. Like, they’ll be haunted by the smell of it for the rest of their lives.
My friend said my jokes were terrible. I told him to eat shit and taste it. He did. And now he’s haunted by the smell of it.
My cousin said I was a total failure. I told him to eat shit and taste it. He did. And he still smells like it.
My dog ate my homework. I told him to eat shit and taste it. He did. And now he’s a poop dog forever.