A light horse-drawn carriage, or in modern usage, a small vehicle like a golf cart or baby stroller. As an adjective, means infested with bugs or, in computing, containing software errors.
Origin uncertain, possibly from 'bug' (insect) in the sense of something small and annoying. The vehicle sense appeared in American English in the 1770s, while the computing sense emerged in the 1940s with early computer programming.
The evolution from horse-drawn buggies to 'buggy software' shows how technology terms migrate across domains - both original buggies and buggy code can cause unexpected stops and frustrating breakdowns! The Amish community still uses traditional buggies while Silicon Valley debugs software.
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