expression
Slangy, emphatic version of キモい (kimoi), used in very casual speech to express strong disgust or creepiness.
See also: キモい
うわ、その虫きめぇ！
Eww, that bug is gross!
あの映画のグロいシーン、マジきめぇ。
That gory scene in the movie was seriously disgusting.
キモい is the standard slang abbreviation of 気持ち悪い, while きめぇ is a more emphatic, drawn-out variant with a stronger feeling of disgust.
Slang contraction of 気持ち悪い (kimochi warui), via キモい (kimoi). The きめぇ form is an emphatic, drawn-out variant.