A word of exclamation used to describe such strange phenomenon as when a closeted beastialist sniffs the anus of a pregnant dog to get a semi-permanent boner.
That scraggy old man is canopussing Tim's dog.
During his childhood, Allen used to canopus his Danish Labrador whenever his parents would go out.
"...and Benedict beamed through his bushy moustache, appearing canopussy and content." - The Great Gatsby