The Vietnamese word "ồ ồ" is an onomatopoeic expression that describes a deep, low voice. It is often used to refer to the sound someone makes when they speak or to describe the quality of their voice.
Simple Example: "Ông ấy có giọng ồ ồ."
Contextual Example: "Khi anh ấy nói, mọi người đều lắng nghe vì giọng nói ồ ồ của anh ấy rất cuốn hút."
Remember that "ồ ồ" is a casual and descriptive term used primarily in spoken Vietnamese.