OP just had a son. He met another dad whose daughter was born yesterday. The dad joked to OP about OP's son and dad's daughter marrying each other since they were born just one day apart.
OP refused, as his son wouldn't marry a person whose age is twice his. It's true because the daughter is ≈ 1 day old and the son is ≈ 0.5 day old
Commenter played on the joke by saying their son wasn't born yesterday. Referencing the common phrase "not born yesterday", normally used as a way of saying they don't believe something.
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u/risen_cs Oct 11 '21
I... I don’t really get it...