What is a punter (I think that is the correct spelling)?

I'm an American and I watch a lot of British television and they keep mentioning the word punters. Just wondering what it means. I've checked urban dictionary but they don't seem to have it listed. Can anyone help?What is a punter (I think that is the correct spelling)?
1. One who bets (punts) against the bank (banque).

2. One who oars or poles a punt (pontoon).

3. One who punts a football; also, one who propels a punt (pontoon).

4. (British, slang) one who gambles. See speculator.

5. (British, slang) A customer, often used to refer to the customer of a prostitute.

6. (British, slang) A regular customer of a particular pub or other drinking establishment.



http://en.wiktionary.org/wiki/punter?rdf鈥?/a>



* noun: (football) a person who kicks the football by dropping it from the hands and contacting it with the foot before it hits the ground

* noun: someone who propels a boat with a pole

* noun: someone who bets

* name: A surname (very rare: popularity rank in the U.S.: #45803)



http://www.rhymezone.com/r/rhyme.cgi?Wor鈥?/a>



http://dictionary.reference.com/search?q鈥?/a>



http://www.babylon.com/defineWhat is a punter (I think that is the correct spelling)?
people who bet on horses or gamble are called punters, but then people who go in pubs or buy things off other people are also referred to as punters