Poo/puː/ Definition 1 of 3Pro Tip 1/3Informal Usage Used in casual situations, generally among family or friends, not in formal contexts. Oops, the puppy just did a poo on the rug! Pro Tip 2/3Child-Friendly Preferred term when speaking with or about young children to address bathroom matters. Did you do a poo, sweetheart? Pro Tip 3/3Not for Professionals Avoid using 'poo' in medical or professional settings; use 'feces' or 'stool' instead. The baby has a healthy poo schedule.