'sniffthebutt' tek?

[JesusBuiltMyHotRod]

"If you open your sphincter muscle connecting your small intestine to your stomach, and simultaneously burp, it creates a negative pressure that can be used to insufflate a substance through your rectum."

So going through the ROA part of the DMT wiki, I came across the 'sniffthebutt' tek quoted above.. Now I have just to ask, who came up with this specific process, how did they figure out that you can 'sniff' drugs up your butt and the one I'm most curious of, why?

I mean I understand that it's extremely vascular up the bum and is a somewhat common ROA for certain drugs and in certain subgroups but this seems like a little bit of overkill.. Then again, they always say go big or go home, right? :shock:

Not knocking it since I've never tried it but this definitely raises a confused eyebrow.