A fart that directly enters the nasal passages while the receiver's nose is pressed against the anus of the fart producer. The fart must travel between nostrils or escape via the mouth. The act may be intentional, but is not required.
"You know that chick, Devon, I was telling you about? Well I was eating her p**** from behind while she was on all fours and she totally gave me a nettyfart"
by Shotaro Putin May 31, 2022