鬼摸脑壳

guǐ mō nǎo ké

(idiom) muddled; momentarily confused

鬼

guǐ

disembodied spirit; ghost; devil

摸

mō

to feel with the hand

脑

nǎo

brain

壳

ké

(coll.) shell (of an egg, nut, crab etc)