The elementary school playground usage of wicked that has infiltrated my house recently is quite pleasing. I understand its current meaning of "cool" or "neato" or "swell" is based on hip-hop usage such as in the title of this magazine in the same way that sick has moved into popular use for what some in 1993 would have covered off by the now embarrassing extreme. Despite the six-year old being unaware she is reflecting a tiny facet of an otherwise unknown international urban sub-culture, it appears that the word has exactly the same meaning I picked up at about the same age in 1972 Nova Scotian elementary school speak which came out of Lunenburg hierarchies of superlative: good then some good then some wicked good with the trump card of all right some jeesely wicked good. Wicked good and simply wicked were also quite proper usages in their own right.
I recall, too, a pal of mine from the Miramichi in New Brunswick once reporting on a monologue overheard by him earlier in life on a school bus ride: "Loohk-a-there-loohk, cohp cahr. Whhuckked."