Mine Sweeping 

Can mean stealing peoples unattended drinks. But it's usually applied to the act of drinking left over drinks in a bar left by other customers in order to get intoxicated on the cheap. Usually done by people who are highly drunk or very poor. Or a mix of any of the above.

Quentin ran out of money, but wasn't quite ready to finish drinking. He mine swept the bar area for dregs until he was sufficiently watered. A group of revellers noticed Quentin mine sweeping and immediately coiled with disgust.

Mine Sweeping by C_B October 16, 2008

mindsweeping 

Drinking peoples drink which have been left unatended at the bar.

You have run out of money its not safe. Look for drink which have been left unatended and drink them his is mindsweeping

mindsweeping by jess paynton December 5, 2007

mine-sweeping

The act of looking for full, untouched alcoholic beverages after the bar has already closed.

After the crew bar had closed, Matt couldn't wait to start mine-sweeping to keep his buzz going.

mine-sweeping by Jeremy V. June 20, 2007

Winesweeping 

The act of stealing, appropriating, or simply picking up an unattended glass of wine, with the intention of aquiring it as your own.
A more difficult yet more sophisticated form of minesweeping.

Ben and I wanted a cheap yet sophisticated night out so we wen't winesweeping at that posh bar in town

Winesweeping by Si Dizzle July 29, 2010