Translation:The tree is between the house and the toilet
'Choo' = lavatory or latrine, so I'm not sure that outhouse would be strictly correct - outhouse could mean any building or construction (with a roof) outside of the main dwelling and may not even have any plumbing! A latrine is normally a hole in the ground (deep or shallow) which may be surrounded by a screen (no roof) of some sort for privacy... I think this is a good sentence because it has been 'localized' - there is often a tree between the house and the latrine!. 'bafu' could also mean a tin bath - no plumbing - filled up with debes of hot water!