Someone who is extremely stupid. You cannot comprehend how stupid they are. There are no words to describe them so you make one up yourself. It is a perfect combination of fuck + retard.
Eva is such a fucktard for trying to milk a chicken. Like what the fuck was going through her mind?
Someone who's daily goal is to ruin other people's day. These people know how to do things right buti ntentionally do shit wrong. Good fucking luck if you work with a fucktard, they will often fuck shit up and try to blame it on you
Jim is trying to do everybody's job yet he can't even do his own. What a fucktard.