The word "smurf" is a made-up term that is often used to refer to someone or something without using its actual name. It can be used as a substitute for any person, object, or action that one does not wish to mention specifically. Full definition
It is said that Belgian cartoonist Pierre Culliford (known as Peyo) had it in mind when creating Papa Smurf in the 1950s. (hyperallergic.com)
Evil Eastern European wizard, Gargamel (Hank Azaria), also has a craven desire to extract essence of Smurf in order to give him the power to take over the world. (lwlies.com)
And if you didn't immediately recognize Yelchin as the accident - prone Clumsy Smurf in the two live - action movies adapted from that cartoon franchise, his identity became clear not long after he opened his computer - generated mouth. (southflorida.com)