The beautiful blue monster from Sesame Street that was sadly murdered by the veggie monster. He is best known for his large consumption of cookies (usually chocolate chip) and the way he eats them. When someone is a cookie monster, then they eat cookies and say "Om nom nom nom!" The health department killed him and replaced him with the Veggie Monster because they didn't want kids to get fat. Like they aren't already.
Friend One: "Om nom nom nom!"
Friend Two: "You are SO the cookie monster!"