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1.
The sound or noise which you get from humping a inanimate object..
*Greg humps pillow* Fo fo fo
by Greghill May 11, 2010
 
2.
N. Two four day work or school weeks separated by a four day weekend.
These next two weeks at school wont be that bad, it's a fo fo fo.
by MV2011 September 03, 2010
 
3.
The sound that you make when you hump an inanimate object.
"Dude, that pole over there is so sexy... I've gotta hump it..."
"Go for it, man."
"...fofofofofofofofofofofofofofofofo..."
by sunburned September 14, 2003