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1.
A whirling dirvish of stupidity. Contraction of retard and tornado.
Lucas is a total tardnado, he's always fubbing something up.
by Smackercalafragilistic February 15, 2006
 
2.
(n.) Noisy, destructive mobile cluster of the mentally retarded that occasionally sweeps through malls, zoos, etc..
A tard wrangler is usually found at the epicenter.
"Get behind the counter, I sense a tardnado brewing!"
by SmexyCitra January 11, 2012