Yeats is someone who can be sexy but an academic genius that will sweep you of your feet and make you forget all about your boyfriend just to talk to him
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 youthink I would want to discuss YAATSNBN.