(Adj.) Being of serious disrepute while retaining an intangible and inexplicable attractiveness.
"The nightclub was widely perceived as shadyass, yet people waited an hour to get in.

Many in the European community consider the Euro to be shadyass, yet most non-EU members are eager to join."
by CIS 2011 January 31, 2011
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Someone who tries to hide something by manipulating his or others' actions or words to his own advantage in order to attain something for his own benefit. This person may also hide information by not saying anything or lying.
1: "I thought he was going to his girlfriend's house."
2: "Nah, he went to freeload some beers at John's house...and he's not picking up his phone either."
1: "Wow, what a shadyass bitch!!!"
by Sektatasek July 27, 2011
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