"삐뚫은" => 비뚤은 (비뚤다) or 삐뚤은 (삐뚤다). 비뚤다 is an adjective meaning "crooked", "not straight", describing physical things or someone's attitude or mindset. And 비뚤은 is an attributive form modifying a noun. (in Korean, adjectives are much like verbs). "싸움박질 매일 삐뚫은 열등감 씻어" is a slightly odd sentence (싸움박질 doesn't connect smoothly with the rest). It means "Get rid of the twisted inferiority complex (and / from) the fighting". 비뚤은/삐뚤은 seems better suited to physical crookedness. For describing an attitude, 비뚤어진 (from 비뚤어지다 - become crooked) might be better.