A donk bet, from what I understand, is a bet placed or called with the worse hand, but which wins the money because of an unexpected but fortunate turn of events. Nothing wrong with that, actually I feel great when that happens to me. Problem is that it does not happen often enough to be lucrative, so you want to avoid placing bets like that. However, the ones who openly criticize your play at the table after winning a hand with a donk bet are just sorry losers, enjoy your win and tell the to go screw themselves.