A person who has the capability to communicate to and/or attract dolphins. Similar to a dog whisperer, a dolphin whisperer is very egotistical and proud of their gift, and often becomes jealous whenever a dolphin shows attention to another person.
Cattie: "The dolphins just keep coming to me!"
Caleb: "That's because you must be a dolphin whisperer."
Westley: "Hey, a dolphin finally's coming to me!"
Caleb: "... Cattie, why did you push that dolphin away? Westley was finally going to touch his first dolphin!"
Cattie: "Because I'm a dolphin whisperer."