numpty

e.g a bit of an idiot
someone who is a bit of a novice

"he's a fucking numpty"
OR
"dont be a numpty"

Chunkymonkey

Little bender with a pointy ass head aka bean head that drives hot pink cars so basically a (the ultimate faggot)

Tom is such a chunkymonkey

munter

e.g a person who is not exactly good looking, has fallen into the ugly tree and hit every branch or someone who is challenged in the good looks department.

"errrrrrrrrr look she's a ugly munter"