Fo time is similar to "go time" but specifically pertaining to a SHTF type scenerio, including, but not limited to a Zombie outbreak, Major terrorist attacks, urbanized rioting, martial law, basically any calamity that requires men of action to defend their homes/ families/ country ETC.
Made popular on firearms forums such AR15.com
Hey, the lakers won a game, and they are rioting in down town LA , if this keeps going...it could be Fo Time.

Ohh boy, some terrorists just blew up ****, get your gear ready..its Fo Time

Ar15 is going crazy, is it Fo Time ?
by M4arc July 23, 2011
Get the Fo Time mug.
usually at a party when people go outside for a cigarette break, or any time when someone smokes a cigarette
Its Fo-Time
by Catfuckers suck December 1, 2009
Get the Fo-Time mug.
When you're out with your friends havin a good time, and a sleazy guy walks by and asks for your number. The ultimate way to reject him is to use this line.
Sleazy dude walks by...
Sleazy dude: DANG GURL! U GOT SOME FINE ASS CURVES! WAS YO NUMBA? HOLLAAA
Girl: I AINT GOT TIME FO THIS!
by QUEEN MAE MAE July 17, 2009
Get the I AINT GOT TIME FO THIS mug.