A churchwarden pipe is a special type of smoking pipe that has a long stem. The stem can be up to 16 inches long! That's almost as tall as a toy giraffe.
The stem is made of wood, and the bowl (where you put the tobacco) is usually made of clay or briar. The bowl is smaller than a regular pipe bowl, so you don't need to put as much tobacco in it.
Churchwarden pipes were first used in the 18th century by churchwardens, who were the people in charge of managing the church. They would smoke the long pipes during church services to make sure nothing bad was happening inside the church.
Today, people still use churchwarden pipes because they look cool and are fun to smoke. The long stem also helps keep the smoke away from your face, so you don't inhale too much smoke.
So next time you see someone smoking a really long pipe, it might just be a churchwarden!