To be confused or shocked by something surprising, or to play the word game 'Boggle' using letter cubes.
From earlier 'bogle' or 'bogey' (from Scottish, meaning ghost or phantom), suggesting something that startles you. By the 16th century it meant to hesitate or be confused.
The board game Boggle was created in 1972 and became famous for scrambling letters in a dome—the random shaking motion perfectly matches the 'boggling' feeling of confusion!
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