Jenna Wack Share definition Flag Wacking somebody off by hitting the head of their penis with your palm repeatidly I was in the movie theater with my girlfriend the other day and she decided to jenna wack me. It hurt like hell Jenna Wack by michealjackson69 April 2, 2011 0 0 Get merch Get the Jenna Wack mug. Buy Now — $32.95 See more merch