The act of masturbation with ones self being the focus of stimulation; usually performed by an individual whilst looking in a mirror when they are somewhat excited about a recent success or achievment.
Tom: "Where's Kev"?
Chris: "Not sure, but he did ask me for a mirror..."
Alex: "He's gone off for a Narcissistic Power Wank"

Or,

"Man! I'm so psyched! I could really use a Narcissistic Power Wank right now!"
by Jeff McBeckson October 6, 2016
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