na-adjective, noun
in another dimension; on a completely different level
Slang abbreviation of 次元が違う (jigen ga chigau). Used to say someone or something is in a different league, overwhelmingly superior or different in quality. Common in casual conversation and online.
See also: レベチ
あの選手はジゲチだ。
That player is in a different league.
彼の料理の腕前はジゲチすぎる。
His cooking skills are just on another level.