The act of sitting on one's hand for 20 minutes to make it go numb, and proceeding to jerk off with that hand. This will give the feeling of a hand job from someone else.

The Nussy, or the “nose pussy”, if you will, was discovered during the corona virus pandemic of 2020. People that had to be tested for Covid-19 had to have their nose swabbed right where the brain connects, which often led to people rolling back their eyes and gagging.

A nose-swab-fetish developed from this, because we, as humans, ruin everything.

Sitting on your hand until it is numb, then proceed to rub one out.

From Chapelle Show:
To masturbate while you hands are numb, to give the sensation that someone else is pleasuring you.

When you sit on your hand until it becomes numb, then masturbate.

Sitting on your hand until it falls asleep and then jerking off, giving you the feeling of a hand job from someone else.

When one sits on ones hands until there are numb and then jerks off. This will feel like a job from someone else, hence the name, "the stranger"
Derivatives:
Mr. Freeze - stick joor hand in icewater until it is numb and proceed
The Snowman - stick your hand in snow and proceed
Pyro - Burn your hand until you cant feel it and proceed