A very quick hand wash (generally not involving soap) by a person who has just urinated in a public restroom, expressly to let others in the restroom see they haven't left without washing, when otherwise - had there been no one else in the restroom - they wouldn't bother
Restroom patron 1: "That guy barely got his hands wet at the sink, then walked out!"
Restroom patron 2: "Yeah, that's a formality wash"
Noun, word used to describe really filthy, manky, disgusting living conditions, not necessarily inhabited by 'ferals'. Such living conditions transcend normal grossness and are rampantly foul. Ferality can be seen in some student flats and at campsites at music festivals. Also used to describe the way of life and attitude that accompanies such living conditions.
When you use an empty bacon packet as a plate and a lighter as a fork and make bongs out of salamis (and use them), you know you're living in ferality.
A byproduct of customs and morals, derived where formality is already "dead" or out-dated and, popularly, seens to prevent progress or simply kills usable time with something unimportant.
Tying ties for special occasions such as a job interview or marriages with the Double-windsor knot is a formality just as much as using a Three piece suit with three buttons and single breasted.