An animal (e.g. cat) that is brought aboard a fishing vessel. During long, lonely voyages, the fishermen get horny and make sweet love to the animal. This is what make the animal a "fisherman's friend."
Fisherman #1:"That 3-week fishing trip was sure brutal. I can't wait to get home to the bar to hook up with the first girl I see!"
Fisherman #2: "I'm not too bad, I had my Fisherman's Friend to keep me company!"
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