So, prior to the ongoing WotC OGL Debacle™ I'd use "D&D" as shorthand for most things relating to the hobby. I preferred that to "TTRPG," anyway.
It's not even like D&D was the first game I played or the game I have played most. But D&D does roll off the tongue nicely.
What are your fun or rad alternatives to referring to the hobby as "Dee En Dee?"