split on a rock

hit rock bottom

To reach the lowest possible state in one's life.

make like a banana and split

To leave, depart.

piffy on a rock bun

A person ignored or sidelined from an activity

rock bottom

The very lowest possible level.

rock hound

A person who collects rocks and minerals from the natural environment as a hobby.

rock on

To party to music, especially rock, or to continue to perform any such music; to maintain a lifestyle in keeping with, or inspired by, youth rock culture.

rock out with one's cock out

To enjoy oneself immensely, to party.

rock the boat

To disturb the status quo or go against rules or conventions, as in an effort to get attention.