They have a strange tendency to wear sunglasses indoors in a futile attempt to cover up the damage of the previous evening, often spent with short chavs.
The sister term, 'bellend', which summarises the above, is sometimes used when time is of the essence, or to finish off a sentence which already includes the term, Big Fat Wanker Dyke
"I know. It's a good job she's wearing her sun glasses indoors though, otherwise she'd look proper hanging. No doubt was with that short chav again!"