phr. first in, first out; the first items placed in the stack are the first items to be retrieved. (Computers. Acronym. See also GIGO; LIFO.) : Oh, I thought this thing was FIFO, and I put the stuff in the wrong order.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw-Hill Education.
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