A human child, though not necessarily a baby. Similar to the word furbaby, used by Eleanor in Accounts Payable to refer to one their nine cats as if they were a human child. Humans are covered in skin rather than fur. The proper context for the use of skinbaby is when someone is annoyed by people that use the word furbaby.
I was invited to my coworker's birthday party for their dog. I asked if I could bring my skinbaby and she seemed offended I'd even ask.
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