a wicked yank is when you ain't jerked off in a while and your roommates are gone so you light a candle and take a trip to wonderland, just you and your shmeat having a little yank together
"yank" is an abbreviation of "yankin tha shi," a euphemism for jerking off
"wicked" refers both to the sinful nature of the activity, and the fiendish gusto with which it is carried out
"hey man how was your weekend"
"pretty good! i had a WICKED yank on saturday and then i hit the gym"
"haha cool"
the type of person who can be described in multiple horrible ways. A wicked type soul would be someone to be either unpredictable, an asshole, someone who surrounds themselves with the wrong people, etc.
Bro I: KJ just tends to surround himself with the wrong people Bro II: Yeah, he's kinda like a wicked type soul, you know?
Bro I: What the actual fuck are you talking about