Wicked high tides a common problem on Morrissey Blvd. Photo by Lauren Glynn.
A general intensifier; very: "He's wicked nuts!"
The following is from a Reddit discussion:
In Spanish class we were learning the difference between "conocer" -- to be familiar with", and "saber" -- to know as a fact. The professor used the example of the city of Boston: "You would 'conocer' the city of Boston. You would 'be familiar with it.' You couldn't "saber" the city of Boston because you would have to know every inch of the city, to know it as a fact. That can't be done."
Matt then said aloud in his perfect Boston accent, dead serious:
"Albit Einstein could. He's wicked smaht."