Definition: buggy

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Source: WordNet (r) 1.7 

buggy
     adj 1: informal or slang terms for mentally irregular [syn: balmy,
             barmy, bats, batty, bonkers, cracked, crackers,
             daft, dotty, fruity, haywire, kooky, kookie,
             loco, loony, loopy, nuts, nutty, wacky]
     2: infested with bugs
     n : a small lightweight carriage; drawn by a single horse [syn:
         roadster]

Source: Webster's Revised Unabridged Dictionary (1913) 

Buggy \Bug"gy\, a. [From Bug.]
   Infested or abounding with bugs.
Buggy \Bug"gy\, n.; pl. Buggies.
   1. A light one horse two-wheeled vehicle. [Eng.]

            Villebeck prevailed upon Flora to drive with him to
            the race in a buggy.                  --Beaconsfield.

   2. A light, four-wheeled vehicle, usually with one seat, and
      with or without a calash top. [U.S.]

   Buggy cultivator, a cultivator with a seat for the driver.
      

   Buggy plow, a plow, or set of plows, having a seat for the
      driver; -- called also sulky plow.