poo poo in English dictionary poo poo Meanings and definitions of "poo poo" (UK, puerile, uncountable) excrement. (UK, puerile, countable) a piece of excrement. an alternative spelling of pooh-pooh, to dismiss an idea etc. noun (Britain, childish, uncountable) excrement. noun (Britain, childish, countable) a piece of excrement. verb Alternative spelling of [i]pooh-pooh[/i] more Grammar and declension of poo poo poo poo ( plural poo poos) poo poo ( third-person singular simple present poo poos, present participle poo pooing, simple past and past participle poo pooed) poo poo (plural poo poos) poo poo (third-person singular simple present poo poos, present participle poo pooing, simple past and past participle poo pooed) more Sample sentences with "poo poo" Declension Stem Match words all exact any Try again Authors