YAATSNBN is Yet Another Abomination That Shall Not Be Named. A Term used to refer to the 5th edition of the Dungeons & Dragons game (produced) by Wizards of the Coast, used primarily by those who prefer the earlier (TSR-produced) versions. It is a tongue in cheek play on the abbreviation TETSNBN and TATSNBN. Pronounced "Yats Bin".
If I didn't want to discuss TETSNBN or TATSNBN, what makes you think I would want to discuss YAATSNBN.
Ya’at’eeh is how the Navajo greet each other. It is always accompanied with a hand shake, and, if the people don't know each other, it is usually followed with a real introduction.
Additionally, “Yá’át’ééh abiní” is the way to say good morning in Navajo.
It can also be used with ‘shił’ as in ‘shił yá’át’ééh’ to mean ‘I like it.’
Two bros meet at a party and grab hands to shake, one of them saying ya' at' eeh in greeting. When everyone else is like Da Fuq they just grin and flash their tribal tats. They know what's up.