触 is stand for the equipment like graphics tablets for those ACG(animation,comic, game) drawers.Then 大触 is stand for those drawers who have excellent skills.It's kind of like Master in English or Sensei in Japanese. Now we also use 大触 in many other fields。

在某些领域很厉害的高手，如文章写得好的叫文触，画画棒的也可以叫触。最初起源于游戏。

do you know Picasso or Monet Person who is extremely awesome in some fields its usd in Internet and Spokenlanguage