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To be acting like a clown, making jokes when you should be being a real man. It’s like saying "facetious" but with more nonsense and less dignity.
"He was being a seafish again, laughing at my bad joke like it was the best thing ever."
"She said she was going to work, but she was just being a seafish the whole time."
"I told him I was serious, but he was being a seafish and said, "You’re funny.""