ガチ勢ぜい

noun

hardcore crowd; serious enthusiasts

Slang term for people who are extremely dedicated to a hobby, game, or interest, often to the point of being competitive or obsessive. Can be used admiringly or critically.

See also: ガチ

• あのゲームのガチ勢ぜいは毎まい日にち何なん時じ間かんも練れん習しゅうしている。

  The hardcore players of that game practice for hours every day.

• ガチ勢ぜいの集あつまりだから、初しょ心しん者しゃはちょっと入はいりづらいかも。

  It's a gathering of serious enthusiasts, so beginners might find it a bit hard to join in.