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1.
Similar to tub of lard, but used with dripping sarcasm or playful irony to describe someone who is far from overweight.
"I know! I'm such a lub of tard!" ~incredibly skinny guy

"Look at that lub of tard. Gawd, she must be a size 0, maybe even a size 1!
by Kalystaa February 28, 2008
 
2.
A phrase to describe fat people, usually who are being nuisances and annoying. A saying that you meant to say "a tub of lard" but you messed up somewhere.
"Move you fat lub of tard! Oh wait I'm sorry, I didn't know you were sitting there eating your double XXL fries while you sit there and take a fucking nap!"
by Mr. Lopezo November 21, 2012