sna·fu (snā-fōō') n.
pl.sna·fus A chaotic or confused situation. adj. In a state of confusion or chaos. tr.v.
sna·fued, sna·fu·ing, sna·fus To make confused or chaotic.
n. an accident; a foul-up. (Acronym. From situation normal, all fouled (fucked) up. Also capitalized.) : What a snafu! All the power went off when you turned on the coffeepot.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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1941, U.S. military slang, acronym for situation normal, all fucked up, "conveying the common soldier's laconic acceptance of the disorder of war and the ineptitude of his superiors." ["Oxford English Dictionary," which seldom fails to delight]