식겁하다 = freaked out Its not a slang :) Korean people like saying “ to eat the fear “ = 겁 먹다 In the same way, 식겁하다 means the same meaning Anyway, you can take the meaning as scared in the English way And you cannot use it in any formal situations :) The word is too casual basically

감사합니다 ^^

(1) It is not a slang. It is consisted of Hanja (Chinese character), 식(eat/have) 겁(frightened) 식겁하다 is like 겁을 먹다. 식겁하다 means that you are surprised and frightened. (2) yes.