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A bastardisation of 'Must-be'. A musbee is a drink, usually alcoholic, that an unwitting person has left unattended in a pub or club. Naturally the unguarded beverage becomes fair game to anyone willing to drink it, as it would be a crying shame for good booze to go to waste. The cheapest way to get drunk on a night out, very popular amongst piss poor students and alcoholics. WARNING take a musbee at your own peril, if the snatch is poorly timed you may be confronted by the musbee's original owner, who may take exception to you nicking his drink.
Ah look an unattended drink has been left on that table... musbee mine

I'm skint so I'll be hitting the musbees tonight lads
by aztekcamel December 17, 2015
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