Sorry, I'm not with you on the 'coo-ee'. We might say an interrogative 'Hello?' or - starting low, going high, coming half-way down - 'He-llo-ooo!'. Or - starting halfway, going down, halfway up, then rising; rhythmically - 'A-ny-bo-dy home?'. Or just a flat 'anybody' and up on 'home'.

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I'd forgotten about the clapping on gameshows. Just all part of the general inanity, I guess. Probably where Trump got it.