Sino-Tibetan: The word is thought to be derived from the Sino-Tibetan root pu-, which means "to blow" or "to breathe."
Meaning:
An interjection expressing disapproval or contempt.
A name for a teddy bear or other stuffed animal.
A derogatory term for a person who is foolish or worthless.
Origin:
As an Interjection:
"Pooh" was first used as an interjection in the 16th century to indicate dissatisfaction or disgust. The exact origin is unknown, but it may have been influenced by the sound made when blowing wind.
As a Noun for a Teddy Bear:
The name "Pooh" was given to the teddy bear character created by A.A. Milne in his 1926 book "Winnie-the-Pooh." Milne's son, Christopher Robin, had a teddy bear named "Edward Bear," which he nicknamed "Pooh."
As a Derogatory Term:
The use of "pooh" as a derogatory term originated in the 19th century. It is likely related to the interjection, implying that the person is worthless or deserving of contempt.
Other Usages:
"Pooh-pooh" is a verb that means to dismiss or belittle something.
"Pooh-bah" is a fictional character from Gilbert and Sullivan's "The Mikado" who holds multiple offices.