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A mythical fairly like creature that can not been seen by human eyes.

It is said to thrive and lay eggs in areas where there is an alcohol concentration between four and five percent.

Often mistaken as a fruit fly

Used as an excuse by gay chefs to explain why beer has gone missing
Jermaine: Yo Ange mate what happened to my pint it was full when I left

Andrew: Fuck knows mate it's those god dam beer flies again (while wiping his lips after sipping the beer)

Jermaine : God damn you Beer Fly!!!
Beer Fly by FunkiestCoffee July 13, 2010
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Flying beer to the rescue 

When a beer just appears
Oh I was just sat down sobering up by Fulham Riverside then there was a flying beer to the rescue.
Small insects more commonly known as fruit flies.
The word is from the dutch word 'Biervliegje' wich is commonly used by the dutch to describe the insects who have a taste for alcoholic beverages,especially fruit flies.
Fruit flies have a taste for rotting fruit and in nature the smell of alcohol is like hitting the jackpot for creatures who live of rotting fruits.
The beerfly is any flying insect that can and will land in your fresh pint.
But most of all they will do it over and over again if given the chance!
Beerfly by Picobyte August 25, 2009
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