The phrase identifies a specific type of attire intended for celebratory wear on October 31st. It references a character named Master Shake, familiar from the animated television program Aqua Teen Hunger Force, and connects that character to the tradition of dressing in costume for Halloween. The terminology suggests a costume designed to resemble or represent the aforementioned character.
This type of costume allows individuals to express fandom and participate in popular culture during the Halloween holiday. The decision to embody this character can be influenced by factors such as personal preference for the show, comedic value, or the desire for a recognizable and potentially humorous outfit. Historical context suggests the popularity of this as a costume option rises and falls with the program’s cultural relevance.