It’s a common trope for genies to purposefully misinterpret wishes, this one in particular being a common one where someone wishes for “a million bucks,” meaning dollars, but the genie interprets it as a million male deer and gives them that instead.
In this case, they’re subverting the trope by the wisher actually wanting the deer, to have sex with for an extra bit of shock humor.
Not as bad as those asinine game guides that all say, “How to walk: press W lololol we’re all so funny and goofy 🤪” stfu that was funny maybe once at most, now the whole community is flooded with that stupid shit.