pooh / pah / bah / (today used as a phonetic component in 部[bu4], 倍[bei4], 培[pei2], 剖[pou1] etc)
咅
=
口
+
立
:
Pinocchio (p) ate too many mandarins (口), so he has to make a big poo-poo (咅) into a vase (立) in the outhouse (ou3). It is very stinky, so all other visitors exclaim "bah!" (咅) as they pass the vase.