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the word is a derivitive of for sure. for sure turned into fo sho, then it was put together to form fosh.
fosh yo momma was good last night. Fiona is fosh a hotty.
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3
The combination of a girl who is Fit and posh. Normally found in the countryside riding horses, or going shooting. Well spoken, but not snobby.

Created by ECP and CG
Woah that girl was such fosh!
by ECP September 05, 2012
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4
mistakenly used as a acronym meaning FUCK OFF SHIT HEAD by kewanee high school faculty members of kewanee IL. It actually is derived from for sure, but those idiots don't know anything.

not acceptable for freshmen follies t-shirts.

The principal be hatin on me for talking slang. I told him to FOSH
by lame like betty October 19, 2008
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5
A hybrid/slang for the two words For Sure.
It's easier and quicker to text and express to friends then saying For Sure.
Q: Hey do you want to hit this?
A: Fosh!
by Ccal831 January 14, 2009
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