In Poker the term Donkey or Donk has become the modern poker term for fish. A Donk is a poker player who will play with the worse cards and then somehow manage to have you beat by the the river. It’s not easy to beat these kinds of players because in general they are gamblers who don’t use poker skills to win, donks are willing to take a chance with any two hole cards regardless of their value or poker hand ranking. With careful observation of the play on your table you should be able to recognize these players within the first 10 hands.
Watch to see who is raising pre-flop and who calls, study their play to the showdown. If the raiser raised for no reason or the caller called with nothing you should make a note on these player, most online poker rooms allow you to write notes. You should label these types of poker players as Donks for future reference because when you got the nuts they will pay the price.