Mercy Wank Share definition Flag To be on ones hands and knees masturbating frantically while crying. Usually after being dumped. "I see Matt got dumped" "haha yeah he'll be having a mercy wank tonight" Mercy Wank by Shabberz February 14, 2013 0 0 Get merch Get the Mercy Wank mug. Buy Now — $32.95 See more merch