We don't have any synonyms for poo-bah yet.
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Definition of poo-bah:
(n) :
(uncountable, childish) Feces.
(n) :
(countable, chiefly UK, childish) A piece of feces or an act of defecation.
(v) :
(intransitive, childish) To defecate.
(v) :
(transitive, childish) To dirty something with feces.
(n) :
(uncountable, slang) Cannabis resin.
(n) :
(slang) Champagne.