someone or something that is adorable, but specifically in the way that really old things are, which is why it is named for the famously old wizard Merlin. Can also be abbreviated to "Merls".
Friend: "my grandpa called last night to say how sad he is that Hillary Clinton won't be President. He said all he wanted was a female president in his lifetime and he's afraid he missed his only chance."
Me: "What a Merlin! My grandpa just spouts racist shit while farting."
"That puppy over there is giving us the puppy eyes, what a little Merls."
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