1) Are you for real 2) Are you serious 3) Dude, you with me 4) Encouraging word 5) Half a 2002 Sheryl Crow album 6) Hey, what are you waiting for 7) Hurry up, will ya 8) Impatient urging 9) Informal encouraging word 10) Peer-pressure challenge 11) Peer-pressuring word 12) Shout of encouragement 13) Slangy summons 
Come on