Do Hobbit. É um tique verbal que ele desenvolveu.
Suddenly up came Gollum and whispered and hissed: "Bless us and splash us, my precioussss! I guess it's a choice feast; at least a tasty morsel it'd make us, gollum!" And when he said gollum he made a horrible swallowing noise in his throat. That is how he got his name, though he always called himself 'my precious.'