London slang for costumer, may also be used for "johns" (among prostitutes and police agents), people who watch porn movies or go to strip joints regularly.

Also a customer in a shop/establishment.
(UK)

One who visits brothels.

However in polite company, one who bets (on horce races), or visits your retail establishment.

Someone who is ill-informed and liable to be taken advantage of. A sucker who lacks inside knowlege or savvy.

(In the world of professional skiing, ski racing, selected freestyle skiers, upper-level alpine skiing, those skiers 'in the know')
A lower-class skier. A skier that cannot ski a blue or black ski run. A certain breed of skier frowned upon by other skiers that know what they are doing. Often wears the 'punter uniform' consisting of a jacket from the 60's, jeans tucked into ski boots, a baseball cap and sunglasses or a neckwarmer worn as a hat. If this describes you, go away.
Also, all snowboarders.

One who innovates and attracts followers, normally by unusual means - an example of which could be barking or creating phrases. Usually a very sexual being who likes to be touched.

A program to flood peoples AIM or other Instant Messaging accounts. Flooding a person's account will deliberatly cause an error in the person's account, therefore causing that program to crash.