Top Definition
A fun-vacuum: somebody with the ability to suck every ounce of fun out of a room, whether intentionally or not, at the most inopportune of times.

To alert others of the presence of a vafuum, one may make the sounds or mime the actions of an invisible vacuum cleaner sucking up the fun. It is also commonplace to ask others to lift their legs/arms up, because there's a bit of fun hidden under there that the vafuum missed on its first pass.

An extreme case of vafuum-ing is known as a MOAV - Mother Of All Vafuums.
{in a deep voice} 'Alright guys, I reckon you should just keep it down, we've got a meeting in the morning and I reckon it's just unprofessional.'
'Fucking hell, Nick, stop being such a vafuum.' {pretending to use vacuum cleaner} 'Vvvvvvvvvvv....'
by lenny_20 April 20, 2010

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