Verbal response to a bone question asked by a superior. Bone questions asked by juniors are dealt with differently.
Further to earlier explanations, within the British Army, also used in response to an answer to an obvious question. This is a question that you have set the other person up to answer. Can become quite frustrating as you become paranoid answering any question in case it is a Wah!
Steve: "Is that a can of beer in your hand Bill?"
Bill: "Bugger, been Wah'd again!"
See also Yarp, sovereign anti-wah cure.
Wah in Urdu is translated into wow. In Indo-Pakistan the term 'wah wah' maybe said in a mocking or sarcastic way in order to humiliate the person it is being said to. Over time this may have been shortened into the single 'wah' which has entered the British Army lexicon.
Wah is also the name of a place in Pakistan. Legend states that one of the Mughal Emperors, probably Akbar was on a journey to Kashmir. On the way, his caravan stopped at a spring in Punjab to quench their thirst. Remarking at the quality and purity of the water, Akbar said Wah! which means similar to the English word Wow. That spring became known as Wah and the city gets its name from this event.
Note for mongs: A wah is not the same as a wind-up.