A buggy is a light carriage pulled by a horse, popular in the 1800s and early 1900s before cars became common. Picture a small cart with large wheels, a seat for two or three people, and a single horse in front. Families used buggies to travel to town, visit neighbors, or go to church. Some Amish communities still use buggies today, preferring this traditional form of transportation.

The word also refers to a baby stroller, especially in British English. When parents push their baby around the neighborhood, they might call it a buggy instead of a stroller.

In a completely different sense, when something is buggy, it means it has problems or doesn't work correctly. A buggy computer program crashes unexpectedly or displays error messages. A buggy video game freezes or glitches at the wrong moment. Programmers spend lots of time fixing buggy code, tracking down the bugs (errors) that make their software behave strangely. If your science project robot keeps turning left when you want it to go straight, you might say it's acting buggy and needs troubleshooting.