Fart Sniffing 

The actual term used by Dehner to inhale the seeping gasses that escape the butthole.

Most often while doing the 69 or rusty trombone.

Palmer was caught Fart Sniffing Kristy on her wedding night.

Sean and Nicole take turns Fart Sniffing while sitting at No Worries.

Fart Sniffing by All girls know Long Pole Joe July 19, 2020

yelling and sniffing 

A kid-friendly term to sensor the word "yiffing." First used by MatPat and Stephanie on GTLive to make Dayshift at Freddy's slightly more appropriate.

Mat: Time to yiff the fox!
Steph: Don't do it, Matthew. No yelling and sniffing of the Foxy allowed.

yelling and sniffing by PoweredByDietCoke July 22, 2017

turtle sniffing cotton 

When you unsuccessfully attempt to hold in a turd and the end pokes out into your underwear, generally resulting in a skid mark.

Man, I need to find a bathroom bad. I've got a turtle sniffing cotton.

turtle sniffing cotton by Beamer from Hell October 24, 2008

book sniffing 

1. Breathing in the sent of a book; often done in secret.
2. How book nerds get high.

Gerald likes book sniffing at lunchtime. It makes Gerald happy!

book sniffing by CakeforFlowers March 9, 2017

snifftey 

A word that means cool, swaggy, nice.

bearded john: do you like my new coat:
SusanKun: yeh, it's pretty snifftey

snifftey by phangirlNo1876 April 2, 2017

sniffathon 

A lengthy and sometimes grueling contest that is held to see who has the best sense of smell in all possible realms, from roses to dog shit.

I entered the sniffathon feeling like I could rule the world, but by day’s end I couldn’t smell my way to my own ass, I was that overloaded by the experience.

sniffathon by Dr Bunnygirl November 4, 2019

Sniffing My Dick 

All up in my business

Dude! Quit sniffing my dick, man!

Dude, Ms.Brinkmann was totally sniffing today!

Sniffing My Dick by Jelly Jensen September 30, 2008