The Vietnamese word "ôn vật" refers to an "imp" or "little devil." It describes a mischievous or playful character, often associated with tricks or pranks. This term can be used to depict a person, especially a child, who is naughty but in a light-hearted way.
While "ôn vật" primarily means "imp" or "little devil," it can also imply someone who is clever and crafty in a non-malevolent way.