What is "boston butt"

Boston butt or pork butt is the American name for a cut of pork that comes from the upper part of the shoulder from the front leg and may contain the blade bone. Boston butt is the most common cut used for pulled pork, a staple of barbecue in the southern United States.

In the United Kingdom, Boston butt is known as pork shoulder on the bone, since regular pork shoulder normally has the bone removed and then rolled and tied back into a joint.