(Internet slang, video editing) blue screen

(Internet slang) Abbreviation of ブルーバック.

play dumb, feign ignorance / (slang) evade one's responsibilities, especially by failing to appear to perform a duty

necessary evil

necessity (quality or state of being necessary, unavoidable, or absolutely requisite)

unnecessary

needlessness

Alternative form of ファストバック (fasutobakku, “fastback”)

(American football, Canadian football) a quarterback

Alternative form of クォーターバック (kwōtābakku, “quarterback”)