Here are some possible interpretations and scenarios where you might hear "oo ah ah":
* A musical expression: It could be a vocalization used in music, perhaps as a part of a chorus or a vocal melody.
* An interjection of surprise or excitement: People sometimes use "oo ah ah" to express sudden joy, surprise, or even awe.
* Imitation of sound: It could be a simple imitation of a sound, like a bird call or a siren.
* A phrase in a specific language: It's possible that "oo ah ah" is a phrase with a specific meaning in another language.
To help me understand better, please provide more information about the context in which you heard this phrase. For example:
* Where did you hear it?
* What was happening around you?
* What was the speaker's intention?
With more context, I can hopefully give you a more accurate answer!