An un-rude versoin of the phrase Fuck You. It can be used in many different places where 'fuck you' wouldn't be accepted, e.g. school, work, public places etc.
Rob:Haha I totally got you!
Ben: Oh Foo You Rob. Foo You.
by Katieee'x August 12, 2008
what you say to someone who you think is on sherm
Guy: "Ur a stupi an ugli"
Guy 2: "foo is you on sherm"
by Annoying Piece of Shit? March 23, 2021