Making a series of sharp, hollow sounds like a horse's hooves striking pavement repeatedly.
From 'clop,' a variant of 'clap' combined with the suffix '-ing' to show an ongoing action. The word became popular in the 19th century to describe the distinctive sound of horses walking on hard surfaces in cities.
The internet adopted 'clopping' as the onomatopoeia for how horses walk, but it's become famously associated with MLP (My Little Pony) fan communities—a great example of how old words get new cultural meanings online!
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