Fencepost

Dumbass, twit, know-nothing, moron, idiot, stupid, Abbrievation: Post

That boy is dumb as a fencepost. What a fencepost. They gave that guy a license to drive, he is dumber than a fencepost. What a twit, a fencepost in a farmer's field is more usefull than that fellar. Careful now, don't get too close to that Fencepost friend of yours, his stupidity might rub off on yah.

Abbrievation: What a post!