Someone who is one of more of the following:

fat, ridiculous, rude, big, toadish, grumpy, ill-mannered, rude, a stick in the mud, always in the way

Just picture a fat grumpy old woman with a huge rear end who is frowning awfully at you from across the room, while wearing a housedress as big as a house, with her hair going every which way, and either glasses or warts or too much makeup, or all three.

A toadish imp with slighty jewy charateristics. Generally found in Wales.