sit on (one's) butt(redirected from sit on one's butt)
sit on (one's) butt
To be idle, especially when action is needed. You can't just sit on your butt all summer. Get a job, join a club—do something with your time! I was tired of sitting on my butt while so many people in the city needed help, so I decided to join a homeless shelter and try to lend a hand where I could.