The word 'giddy' describes a feeling of light-headedness or a sensation of dizziness, often accompanied by excitement or happiness. When someone is giddy, they might feel overly joyful, silly, or unable to think clearly, as if their head is spinning. It's often used to express a positive state of overwhelming happiness or excitement.
The word 'giddy' originates from Middle English 'gidi', which is likely derived from Old English 'giddian' meaning "to be dizzy or to falter" and may also have connections to the notion of being "light-hearted" or "lively." It evolved to denote both physical light-headedness and a state of emotional excitement.