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".