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Incredible loser, sometimes used in a cool way, visciously klutzy.
She is such a klonkin (noun)

She klonks around wherever she goes (verb)

Can you try to be less klonkin? (adj)
by Fallabean 'N frends April 04, 2008
When a woman who has an extremely abnormally sized ass dances and flaunts it in front of you or for show.
"Hey Steve, you wanna get a bite to eat?"
"No Carl, I just saw Regina and Katifa klonkin. I lost my appetite."

by Bloodshows September 04, 2010