Na Foo
A fancy way to say 'no fool' that Hector from Retama Hall made up to sound like a genius, but really just sounds like a confused guy trying to be cool.
'Na Foo?' I said. 'Na Foo!' he yelled back like he just invented the wheel.
During math class, Hector shouted 'Na Foo!' because he didn't know the answer.
My mom said 'Na Foo!' when I told her I failed the test for the fifth time.