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From the best English dictionary IMHO: https://www.ahdictionary.com/word/search.html?q=wow

> wow², n.

> Slow variation in the pitch of a sound reproduction resulting from variations in the speed of the recording or reproducing equipment.

https://en.wikipedia.org/wiki/Wow_(recording)

It literally sounds like guitar wow pedel when it happens. It's due to the fluctuation of the speed of the turntable.

In that video the turntable seems like Audio Technica's Technics 1200sl knock-off version which is quite infamous for instability, it seems fine in short video though. Very impressive nonetheless.

You mean a guitar wahwah pedal? I'd say it sounds more like a flanger pedal.

I think flutter is the same thing, the inability to maintain constant and precise angular velocity.

Wow is slow frequency speed variation. Flutter is fast speed variation.

To an audio person they are distinct sound artifacts. It was common to listen to recordings of pianos in the past to hear these because the piano was the only common instrument that had very solid pitch. (invariant frequency(