What is clouddown in Chapter 13 of Hatchet?

Brain is having a difficult time. He is depressed, and he just wants everything to end. Brian wishes the clouds could just come down and smother him..... make everything go away. He says:

With his eyes closed and his mind open he lay on the rock through the night, lay and hated and wished for it to end and thought the word Clouddown, Clouddown through that awful night. Over and over the word, wanting all his clouds to come down, but in the morning he was still there.