出典:Wiktionary
From get (“to become”) + medieval (“relating to medieval dungeon torture methods”); originally merely collocational when attested in the dialogue of the 1994 film Pulp Fiction, but the collocation took on the function of a phrasal verb, entering the lexicon as a term for torturing severely, after it went viral as a consequence of the film's popularity.
get medieval (三人称単数 現在形 gets medieval, 現在分詞 getting medieval, 過去形 got medieval, 過去分詞 gotten medieval または got medieval)
出典:Wikipedia