Brothers' conversation

In the next room, Stephen is building with megablocs and Rockam is watching on a blanket on the floor.

Rockam: Ggggg Gooo Gaaaaa Gggggg
Stephen: What are you saying, Wockam?
Rockam: Guuuuh, Gooo, Gggggg
Stephen: Serious-wee, Wockam, WHAT?!?