In Boston English, wicked is sometimes used as a replacement for very. examples:
"It's wicked hot out!"
"Yeah, i'm wicked thirsty, let's go get some beers!"

and of course.. wicked pissah, wicked good, wicked awesome, etc.

For many Massholes, hearing someone use wicked as an adjective (e.g. "wicked speed" in the example above) is strange, and almost painful when it's done in a failed attempt at at Boston accent.