Willywhack Share definition Flag When a man is in an aggressive, randy mood and when is refused sex, slaps his willy about everywhere like a huge fit 'My dad willywhacked the table last night after my mom refused him sex' Willywhack by GimpyWimpy April 7, 2009 0 0 Get merch Get the Willywhack mug. Buy Now — $32.95 See more merch