"Blimey O'Reilly" is a British expression often used to convey surprise or astonishment. The phrase combines "blimey," a slang term derived from "God blind me," and "O'Reilly," which is a common Irish surname. It reflects a lighthearted, informal tone and is typically used in everyday conversation. The phrase gained popularity in the 20th century and is often associated with British culture, particularly in media and entertainment. It can be heard in various contexts, including television shows and films, where characters express disbelief or shock. Overall, it serves as a colorful way to react to unexpected situations.