What IS a "dad joke"

My fiancé has always adored what she called my "dad jokes"

I am 25 years old and have no children. Upon looking up the definition of dad jokes, our dear friend Merriam has labeled them as "Indicitive of the type of bad jokes as told by one's father."

My definition is that it must be witty and only funny enough to elicit a fake and non committed "heh" nothing more.

My question is this: Can one who is not a father tell dad jokes? And if so what then is your definition?

Please provide me with your expertise on this matter!

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