Wicked:(Informal Definition) origins- New England, USA.
/ˈwɪk·ɪd/

adjective
Excellent
Synonymous with really, very and hella.

• New England slang that can adds emphasis:
  "That shirt is wicked cool!"

• Used to descibe something as excellent or to express how great it is:
  "This painting is wicked!"

• Used to describe something that is slightly immoral or bad for you, but in an attractive way:
  "She had a wicked grin." or "He had a wicked sense of humor."