The need to poo that comes inexplicably by being surrounded by plants and nature, from allotments to forests.
Luke - "Dude I think I'm going to just squat on that guy's compost heap, this whole allotment is evoking a wilderpoo in me"
Dan - "I've never heard that word used before in my life, you're such a douche"
Noun. Term for the process of defecating outdoors. Taking a shit out in the open.
'I couldn't hold it any longer so I shat right there in the grass. Its the second wilderpoo iv taken in my life.'
Dogs and other animals frequently partake in the wilderpoo, unashamedly, and rightly so.