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adv.- 1. to get kids like batman or in an extremly sneeky or crafty way
2. used to describe the verb batman
3. used to describe a democrat's campain
If Swiper was thievious he would kick Dora's ass.
by Senor Quigles May 22, 2006
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To steal something in an exceptionally underhand manner, normallly from under the nose of the victim.
"That was thievious man! You stole his wallet and then helped him look for it."
by NickE March 28, 2007
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