It's usu. used as a joke insulting ones mother, usu. insinuating about their vagina in some way.
Guy: Your mom has a fancy closet, the fanciest EVER!
Girl: WTF IS THAT?!!1
Guy: If I told you you'd trolololol
Girl: ZOMG FUUUUUU
by Fiendmummy May 24, 2011
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