Buggy

google

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mid 18th century: of unknown origin.

wiktionary

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Origin unknown.

etymonline

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buggy (n.)

"light carriage with four wheels and seats for two," 1773, of unknown origin. OED finds no grounds for derivation from Hindi bagghi "a gig" or another Anglo-Indian source. Extended to baby carriages by 1884.

buggy (adj.)

"infested with bugs," 1714, from bug (n.) + -y (2).