Could the word 'wicked' mean impressive?

Yes, wicked can be used to mean impressive. The Oxford dictionary uses “excellent; wonderful” in its 3rd definition (see below.) A wicked fastball would be a great fastball. The pitcher is particular skilled in throwing fastballs. Jimi Hendrix played a wicked guitar. read more

unjustifiable; dreadful; beastly: wicked prices; a wicked exam. having a bad disposition; ill-natured; mean: a wicked horse. spiteful; malevolent; vicious: a wicked tongue. extremely troublesome or dangerous: wicked roads. unpleasant; foul: a wicked odor. Slang. wonderful; great; masterful; deeply satisfying: He blows a wicked trumpet. adverb. Slang. read more