““Wicked” is a Maineism, not used in Boston in my experience.”
“wicked” is used all over Massachusetts..
it’s wicked cold, that’s wicked expensive, you look wicked good...etc.
Obviously the word has metastasized down from Maine since I left in '77. I never heard it at all growing up until I spent a summer in Yarmouth. I think that was 1959. My cousin used it at the supper table, and I thought Aunt Abby was going to wash his mouth out with soap. Never heard it again in Massachusetts right through '77 when I left for a job in upstate NY. That's how language goes, though. I picked up the word "spendy" during my one year TDY in Minnesota (1999) and I still use it occasionally.