Stuff/stʌf/ Definition 1 of 7Pro Tip 1/3Informal Usage Used in casual conversations, often among friends or in relaxed environments. Can you hold my stuff while I tie my shoes? Pro Tip 2/3Not for People It refers to inanimate objects, never to people or animals. His stuff is on the top shelf, not with the pets. Pro Tip 3/3Vague Quantity The amount of 'stuff' is not specific; it could be a few items or many. She's bringing a lot of stuff for the party.