punter

One who rows or poles a punt (pontoon).

One who punts a football.

A program used to forcibly disconnect another user from a chat room.

Punters generate hundreds of information inquiries to a legitimate user's client, such as invitations to chat. […] The user is punted from the channel, and must rejoin to gain access.

One who bets (punts) against the bank.

One who gambles or bets.

[…] and having only peeped into a play-room at Baden-Baden when he hung on Dobbin's arm, and where, of course, he was not permitted to gamble, came eagerly to this part of the entertainment and hankered round the tables where the croupiers and the punters were at work.

By Savernake the train was 4½min early; we then had the thrill of sweeping through Newbury at 95 m.p.h.—and one wonders if any of the punters on the neighbouring racecourse had any eyes for our flying cavalcade as we swept by, for it was a race day—[…].

A customer of a commercial establishment, frequently of a pub or (alternatively) of a prostitute.

She's working the streets like she does every night / Pulling in punters left and right

Everybody knows your mum is a whore / Getting 'round Piccadilly looking for willy / Punters pull up and say "don't be silly"

A beginner or unskilled climber.

The person who keeps score in basset or ombre.