What is Falldown?
1.
1) An imbecile; someone who can't do anything without support.
2) An imflammatory remark concerning one's appearance or abilities.
Me: That guy in IT can't get anything right...
You: Yeah, he's a real falldown...
Me: Get out of the @#*%& fast lane, falldown!
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2.
A person who is going no where in life
Mike is such a falldown he failed all his courses and never went to class
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