FOS

or F.O.S.


abbreviation

free on station.
free on steamer.
Slang. full of shit (a euphemistic initialism used to avoid explicit vulgarity). See shit (def. 5).

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Example sentences from the Web for FOS

British Dictionary definitions for FOS

FOS

abbreviation for

fructooligosaccharide: a chain polymer of fructose found in a variety of plants, vegetables, and fruits and used as a sweetener
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012