a red headed stepchild's rental mule - A thing or person that’s the worst at everything, like it’s

A thing or person that’s the worst at everything, like it’s the enemy of fun.

That homework was a red headed stepchild's rental mule. I had to do it for a week and I still didn’t get it.

My stepdad’s new job is a red headed stepchild's rental mule. He’s always angry and he yells at the printer.

That old toy was a red headed stepchild's rental mule. It broke, it was dusty, and it hated me.