Growing up in a rural part of New England, ‘wicked‘ was a common staple of the local vocabulary. Not ‘wicked,’ mind you, as in the sense of ‘sinful’ or ‘evil.’ New Englanders convert this adjective to an adverb, creating a synonym for ‘very.’ Relevant examples include:
That boy’s wicked smart!
Or, in an appropriately New England context:
It’s wicked cold outside!