As far as I know, these came from the days when the OnA guys were still on reddit, and decided to have fun when they noticed Pat would rush to defend himself or his works from any crumb of negativity. So, they'd just make up weird shit, wait for a certain lispy fatass to deny them in his characteristic fashion, and laugh at the results; that's also where the blackeroni comes from, if I'm not mistaken.
I'm no expert in Tomlinson Lore, though, so take that with a grain of salt.
I think the farting in vagina thing originated with someone texting Fat pretending to be a black joke stereotype kind of guy.
There is a screenshot somewhere of Fat angrily replying, “No child, you did not fart in my wife’s vagina”.
I think most of the weird stuff is partly from them fucking with him and enduring references are based on his funniest reactions.
The thing is though, he does and says plenty of stupid things without being driven to it.
I think the saddest thing is that he really thinks he is a decent and respectable guy, with a bit of edge.
The kind of guy who you can depend on for dealing with thugs and criminals but is also smart and well informed, successful and trustworthy.
Kind of like old 80s TV show heroes. Like Michael Knight, Magnum PI, or Spencer for Hire.
Problem is, he is literally the opposite.
Fat and unattractive compared to fit and handsome.
Drives a clapped out rustang instead of a cool or expensive car.
A mentally ill wife instead of a a hot girl and a talking car, some buddies including a helicopter pilot or a suave well dressed black guy.
And finally, he never gets the better of the perceived villains who plague him.
He couldn’t be a better written parody of such characters.
It almost seems deliberate.