...I mean, we have [email protected] here on lemmy. Don't crosspost from Reddit and redirect traffic back to that shit hole; just steal the content and post it here fresh.
I believe this is critiquing the quality of Reddit's idea of horror stories, hence the fact it's a screenshot from there. Although I'm sure the Reddit OP intended for it to be satire anyway.
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.