Be a devil Definition 1 of 3Pro Tip 1/3Casual Encouragement Used when encouraging friends to do something out of the ordinary, in casual settings only. Come on, be a devil and dance on the table! Pro Tip 2/3Adventurous Spirit Implies a break from routine or conservative behavior, suggesting an adventurous act. Be a devil and quit your job to travel the world! Pro Tip 3/3Group Dynamics Often used in group scenarios to peer pressure someone into joining an activity for fun. We're all singing karaoke, be a devil and sing with us!