also: げきむず
na-adjective, noun
extremely difficult; super hard
Slangy intensifier for difficulty; common in casual conversation and online contexts.
このゲーム、激ムズすぎてクリアできない。
This game is so extremely difficult I can't beat it.
あの試験は激ムズだったらしいよ。
I heard that exam was super hard.
Similar slang intensifier, but uses the on'yomi reading of 難; 激ムズ is more colloquial with the kun'yomi abbreviation.
Slang compound of 激 (intense, extreme) and ムズ, a shortening of 難しい (difficult).