What is Wicked?
Wicked is (adj) 1. very bad What a wicked thing to say! It was wicked of them to steal the birds’ eggs. 2. behaving badly in a way that is not serious She gave a wicked little laugh. 3. dangerous He came in carrying a wicked axe. 4. very good They do a wicked line in French pastries.
source: Easier English, Student Dictionary Upper Intermediate Level