A disrepectful name for a woman whose naked or sexy pic is used as an aid to masturbation. Either it is uploaded to the web specifically for that purpose, or is found on the web and then used.
Jane: Do your hear what Harry did to Lizzie when they split up? He uploaded some private pics he took of her so the whole world could see her sucking cock. What can she do about it?
Tim: Too late now - she's wankmeat.