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Siffing is a word that you say to people who are Annoying you. No one will know what it really means!!
Stop siffing you fuck!
Siffing by Bobby Poseiden October 27, 2018

Sniffling 

Sniffing, and shuffling at the same time.. used when your sad.
For when shuffling isnt enough to make you happy.
Jordan: What you doing Ryan?
Ryan: Sniffling :(
Jordan: what for?
Ryan: Just broke up with my girlfriend :(
Sniffling by BigBeefyBarstool April 10, 2011

Snifflingus

The act of performing oral sex on a female while suffering from nasal congestion or other assorted symptoms which restricts nasal breathing. Usually accompanied by breathing through the mouth, periodically pausing the act.
I was feeling quite under the weather, and could barely breathe, but wanted to please my girlfriend so mustered up the effort to perform "snifflingus" on her.
Snifflingus by LinkopingPwns September 23, 2014

Swiffling 

The act of being a red neck and sneaking out of the house to get really drunk by hooping moonshine.
My favorite thing to do when I was a youngin', was goin' out to the back forty and swiffling.
Swiffling by A Symbol of Hope March 21, 2009
This is a combination of a "stiff upper lip" attitude and stifling behaviour towards someone else. Making someone do something without giving them a choice (they are stiffing them of a choice!).
A school assigning pupils to do an extra curricular activity. (YOU KNOW WHO YOU ARE!) The pupil has no choice and has to commit time outside school hours to the activity. The school is therefore being stiffling.
stiffling by layla and hayley July 26, 2004

Shiffling 

An onomatopoeia for the sound of cards shuffling, or being slid across other cards.
The shiffling when I play solitaire gives me ASMR.
Shiffling by Aerem November 24, 2021