It's a little late to note this at this time, but you may notice a long gap my posting anything except in the UT due to health, and I was missing from there for a period of months.
I found the information on Reddit, Trump, and Centipede by an internet search using those words and perhaps a couple of others. You can search for something found on Reddit with a little digging. I found the Reddit post from the search, which contained a link to the video.
"Redditor" is a generic term for anyone who uses Reddit. It has nothing to do with Donald Trump.
'Centipede' is a term used in The_Donald subreddit by Donald Trump supporters to refer favorably to themselves. The term is unrelated to the Human Centipede from Cartoon Network's Southpark television show.
The video begins with the audio track of a nature documentary describing the centipede as a 'nimble navigator' with two curved fangs that can inject venom into its prey. The video consists of Donald Trump comebacks, put-downs, and similar comments made during debates and speeches, interspersed with old memes (you try to describe it). Few paid attention until Trump re-tweeted the video.
At that point, Reddit paid attention. Trump became a centipede to his Reddit supporters, who also called themselves centipedes, able to nimbly navigate and inject venom into their prey.
The centipede theme continued in many of the following volumes of You Can't Stump the Trump.
I wasn't there, but I find the history of inside jokes and repetitive phrases on Reddit interesting.
For anyone from Ponca City, Hagrid was the caretaker of the Hogworth school grounds in the Harry Potter series (books and movies) 'till he rung down the curtain and joined the choir invisible.
That kitty reminds me of a kid I knew from Fir Grove Elementary school named "Ears" Ericksson, except Ears' freckles weren't as symmetrical and he had a crewcut.