A person, typically a significant other, with whom continued association would be more trouble than it's worth.
A lover one is planning on soon dumping
Any annoying person
"I think I'm going to break up with that girl. She's just ten more toes than I need right now."
"Dude, why are you wasting your time with her? She's ten more toes."
"Get out of here, you're ten more toes than I need in my face today."