The poophole loophole usually means something different. They say anal sex doesn't count as "losing your virginity." So they can have all the premarital sex they want, as long as it's in the pooper.
Additionally to what others have said it's also quite dangerous. You can drink a fatal amount of alcohol but your body will generally puke before it absorbs enough to kill you.
Using this method (boofing), you don't have that defense, it's absorbed too quickly and your body doesn't generally shit itself to expel poison.
Alcohol gets absorbed by mucus membrane much faster than by going through your digestive tract. And your anus is lined with mucus membrane.
It was a craze a decade or so ago where I live, cause teenagers did that to get drunk without having their breath smell of alcohol, and some of them ended up in the ER.
It was also a crazy in the US. They called it butt chugging. It was funny to hear politicians talk about how we needed to do something about butt chugging
I looked it up and I get it now. I assumed O.B. style tampon with no applicator, which would be difficult to insert. The info I found shows the soaking of the tampon inside the applicator, which makes a lot more sense.
As soon as you asked your initial question I too was imagining someone trying to fit a fully expanded tampon inside them … which is a though I wish I hadn’t