Maybe it’s a portmanteau of AI + giraffe, it seems like this was a problem well known among AI researchers:

Machine responses are only as good as their data set. Take giraffes as another example. An AI trained on examples of questions people asked and answered about photos learned that nobody ever asked a question like “How many giraffes are there?” when the answer was zero. So if you ask that AI how many giraffes are in a photo, they always give a nonzero number, even if there are no giraffes at all.

But I’m not a researcher and don’t know if it’s related or what does that mean now. I would be pleased to learn the answer as well