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
One who staggers drunkenly around stealing the dregs of everybody elses drinks whilst they are on the dancefloor.
Some fucking winesweeper has knocked my pint off.
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Someone who attends a wine tasting event and at the end of the evening proceeds to down the slops bucket containing the fine wine spat out by other participants.
Look at that alky, I reckon he only
turned up for a bit of winesweeper