FOS

FOS can stand for:Faint Object Spectrograph as done by the Hubble Space Telescope.Feature-oriented scanningFactor of safety in mechanical and structural engineering.Fabric OS, Brocade Fibre Channel operating system (computing)FOS/NT - flight operations software from CTAFructooligosaccharideFemale Oral Stimulation 'pleasuring the vagina or clitoris with the mouth or tongue'
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adj. false, not true; counterfeit

interj. splash, plash

Full of Stuff (polite form)  For more possible definitions for FOS, click here
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"false, sham; empty, groundless, baseless, flimsy"

Freedom Of Speech or Full Of Sh**