Definder - what does the word mean?

What is FUUUUUUUUUUUUUUUUUUUUU?

You say FUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU... when you stub a toe

FUUUUUUUUUUUUUUUUUUUUU - video

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