to get extremely drunk,
has no relevance to excretion.
most commonly used between folks in llantwit major.
yo bekki, get your poo out this weekend?
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A nutty, pain in the ass, person or animal.
Finn I diagnosed that horse with Whacked out poo brain five minutes ago!
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'to poo out' - to back out of a situation, to let someone down
'are you still coming out on Friday Eleanor?'
'sorry I can't I'm skint'
'noooo don't poo out'