A common misspelling of "couth" ~ which means to be cultured, refined, and well mannered.

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.

A Scottish coloquilism, meaning to be polite or well mannered.
Mainly used as sarcasm.
And by yer granny.

Awesome, cool, kosher