Someone in a position of power either due to their title or general physical strength that is acting abnormal enough to make one feel unsafe or uncomfortable in their presence.
Derived from a play on words in reference to Jesse Ventura, the 38th Governor of Minnesota and former wrestler of the WWF and the word Sketchy.
Ted: Great, until Mr. Rickard went all Sketchy Ventura on me.
Bill: What happened?
Ted: He started sword fighting himself with his pen, while humming the old school Batman theme during my presentation on last quarter.
A great cinematic example of this would be Mr. Lumberg's dealings with Milton in Office Space.