Fuckupper

The person in your circle of friends who is always fucking things up.

Person 1: How'd things with the project so badly?

Person 2: Oh you know, it was assigned to John, the resident Fuckupper.

Fuckuppance

Your comeuppance for fucking up.

That one bitch got food poisoning after stealing my lunch, so you could say she got her fuckuppance.

Fuckuppable

The ability to be (easily) fucked up

French is one of those languages that seems as if it was made to be fuckuppable. One wrong ending pronunciation and you've just called someone's ass nice.