Etymology
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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).

updated on June 05, 2018

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Definitions of buggy from WordNet
1
buggy (adj.)
informal or slang terms for mentally irregular;
Synonyms: balmy / barmy / bats / batty / bonkers / cracked / crackers / daft / dotty / fruity / haywire / kooky / kookie / loco / loony / loopy / nuts / nutty / round the bend / around the bend / wacky / whacky
buggy (adj.)
infested with bugs;
2
buggy (n.)
a small lightweight carriage; drawn by a single horse;
Synonyms: roadster
From wordnet.princeton.edu, not affiliated with etymonline.