This word is actually an acronym (F.U.A) used to describe incredibly unattractive individuals. This acronym, which stands for "fat, ugly, and annoying", is generally used in the college setting when one male is describing a female to another male.
(Plural form: foo-ahs)
Tim: Dude, did you see that chick in math class? The one who won't shut up?
Bo: Yeah brah, she's a total foo-ah
Tim: No shit.
Micah: Tyler, sorry to tell you this, but all of the females in your entire family are foo-ahs.