This is a skateboarding and snowboarding trick which is similar to a tweak. It is usually used with grabs which cannot employ the tweak, though most grabs can use a bone.

There are only two types of bones. They are the nosebone and the tailbone. As they would suggest they use either the nose or tail.

To do a bone you must simply extend your leg completely. If you are doing a nosebone then you extend your front leg, if you are doing a tailbone then you extend your back leg. The most common useage of this is the Indy Nosebone. Other uses include: Nose Tailbone, Tail Nosebone, Japan Nosebone etc.