Abbreviation for "First In, First Out", and abstractly means that the first item placed into a container or list will be the first to be removed. The system is used by fine resturaunts like McDonalds in order to assure freshest average food quality, though it doesn't address the omnipresent "half of the stock is expired" or "the refrigeration temperature is too high" issues. It is noteworthy that many employees ignore the system altogether in favor of grabbing the most convenient box.
FIFO! FIFO! FIFO, FIFO, its off to work we go. *whistling* FIFO, FIFO, FIFO.
by Eidako July 01, 2003
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Fly in, fly out. As in people who fly to their workplace (usually for a week or two at a time), then fly back home. This type of work schedule is common in Australia, especially in mining companies as the mine site is often quite remote.
FIFO workers make good housemates.
by n3xia March 25, 2012
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Hey, that FIFO can't drive! Dude, get the hell out of the way!
by Katie Prudence September 13, 2003
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Fit In or Fuck Off

Used when interviewing new prospective employees.
Well, you either Fit In or Fuck Off!! It's as simple as that.
by Fenix July 30, 2003
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First in First out. (as in queue from data structures) as applied to when a virgin girl becomes pregnant the first time she has sex.
When I met Sarah she was just 16 and I was flabbergasted to find out she was a FIFO.
by MrGrumpyFace March 19, 2019
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