It's cross to bear, bear in this case being used in the same sense it is in weight bearing, Greeks bearing gifts or even ball bearing. It refers back to the Biblical tale of Jesus carrying his cross to Golgotha.
Lookin' Out My Back Door. Lookin' Out My Back Door is a song recorded by the American band Creedence Clearwater Revival, also known as CCR. The song was written by the band's lead singer, guitarist, and songwriter, John Fogerty.
Look at all the happy creatures dancing on and on. Dinosaur victrola listenin to Buck Owens, doot doot doot lookin out my back door Tambourines and elephants are playin in the band. Won't you take a ride on the flyin spoon doot doo doo. Wondrous apparitions provided by Magicians doot doot doot lookin out my back door. Smile with me tomorrow, today I'll find no sorrow, doot doot doot lookin out my back door.