Originated on AR15.com when a member (Shawnofthedead) was invited to a threesome that included a male and female and started a thread. He, in haste and against the advice of many members, said "fuck it im foing" and was never heard from since.

An obvious typo has now transformed the word "going" to "foing" on the ARFCOM boards.
sgtar15 - Check out my dolls SteyrAUG
SteyrAUG- Fuck that, im foing to clean my white tiles.
by Scorch05 October 10, 2008
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Obama is the fourty fourth president, therefore he will be refered as "Fo-Fo" (4-4) on the streets of America.
I went to D.C to watch "Fo-Fo" get sworn in on inauguration day... It was cold as a mofo up there.
by PleasureCatcher January 20, 2009
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Never trust a used-car salesman, they're all FOS.
by Barbarella11 December 20, 2010
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Short way of saying "before"
Get out my face fo' i whoop yo ass!
by Pizzlej March 19, 2019
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The acronym for a person who is Full of Shit. When someone is constantly telling outrageous lies, typically about themself, in order to impress others.
"Did you hear that FOS was offered a full scholarship to Harvard, but turned it down to be a UPS driver?"
by Quinn Littles May 14, 2009
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