From some American native speakers
I've heard this as "Don't be a Foo!",
it is usually reinforced by a barrage
of expletives. It seems more common
in urban areas, although heard in rural areas
also where it is usually believed to
be used in imitation of typically violent
crime scene investigation dramas
in American television shows.
Actually, the origin of "foo" comes elsewhere:
Foo and Bar
Foo is the first metasyntactic variable commonly used.
It is sometimes combined with bar to make foobar. This
suggests that foo may have originated with the World
War II slang term fubar, as a abbreviation for fucked
up beyond all recognition. Foo was also used as a
nonsense word in the surrealistic comic strip Smokey
Stover that was popular in the 1940s and 1950s. See
also Foo Fighters for more foo etymology.
Taken from:
http://www.wikipedia.org/wiki/Metasyntactic_variable
Chuck
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