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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!
falldown by Scotty March 17, 2004
Mike is such a falldown he failed all his courses and never went to class
falldown by Rozencrantz June 9, 2007

fall down fuck in the ass 

When one has 1 too many tall boy Canadian's
Hey Billy, are you out of beers you fall down fuck in the ass

Fatty Fall Down

Perhaps the only joke that crosses all known cultures, races, and religions. A formula for laughter as old as comedy itself, fatty fall down occurs when a fatass falls over.
Dick: "Dude, did you see that lard butt tumble off the stairs?"

Johnson: "Yeah, dude, everyone was laughing their asses off. Even the fat guy was, and he was shaking like a plate of Jell-O."

Dick: "Fatty fall down never fails, man."

Fall Down 

Someone who cannot be trusted or relied on. A irresponsible individual. A person who fails to excel. A stool pigeon or rat.

The opposite of a "stand up" guy.

Mostly used for males.
Buddy is a real fall down....he ratted his pals out to the cops!
Fall Down by red81 October 18, 2010

fulldown 

a short-hand for the "full run-down"
1. I just wanted to know whether she was OK or not but when I asked her, she gave me the fulldown, explaining she was upset because her kitten had died, her boyfriend had dumped her, and she had lost her wallet.

2. Give me the fulldown on your weekend.
fulldown by PeterNYC123 April 12, 2011