- To pooh-pooh is defined as a way to indicate that something cannot happen, or to make a joke about something.
When someone makes suggestions about where you should eat dinner and you find something wrong with every single suggestion, this is an example of when you pooh-pooh all the suggestions.
pooh-pooh definition by Webster's New World
Origin: reduplicated, reduplication of pooh
pooh-pooh definition by American Heritage Dictionary
transitive verb pooh-poohed, pooh-pooh·ing, pooh-poohs Informal
Origin: Reduplication of pooh.