buggy

(noun) a small lightweight carriage; drawn by a single horse. Synonyms: roadster.

(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. Examples: "It used to drive my husband balmy."

(adj) infested with bugs.