“Aah!” accompaniment

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Possible Answers: OOH.

Random information on the term “OOH”:

Out-of-home advertising (or outdoor advertising) is made up of more than 100 different formats, totaling $6.7 billion in annual revenues in 2012 in the USA.[1] Outdoor advertising is essentially any type of advertising that reaches the consumer while he or she is outside the home. This medium is in contrast with broadcast, print, and Internet advertising.
Taken from Wikipedia