Buggy can refer to various types of carts:

• a dune buggy or swamp buggy;
• a kite buggy;
• a shopping cart (Southern American English);
• a form of baby transport also called a pushchair or perambulator (British English) or stroller (American English);
• a lightweight carriage, as in horse and buggy; or
• a soapbox car or cart (UK), also known as an unmotorised go-kart.
• Buggy is a common name for the Sweepstakes Races, a student run event much like a cross between soapbox derby and a relay race, practiced at Carnegie Mellon University in Pittsburgh, PA.

As an adjective, it means infested with bugs, either literally or figuratively, as in computer bugs.

Buggy the Clown is an antagonist in the One Piece manga/anime series.