Something boggles the mind Definition 1 of 2Pro Tip 1/3Emotional Reaction Used to express strong surprise or shock at something hard to believe. She won the lottery twice, which really boggles the mind. Pro Tip 2/3Remarkable Events Often used when talking about extraordinary achievements or phenomena. The technological advances in the past decade truly boggle the mind. Pro Tip 3/3Express Amazement Implies the speaker is impressed and finds it difficult to comprehend fully. The view from the mountain summit boggles the mind with its beauty.