JP meme trivia via @tikumiya4774_JPN:

[0:27] “gikogiko ha shimasen” (“There’s no need for a sawing motion”)

This meme comes from a funny moment on a Japanese TV shopping show. A man was demonstrating how sharp a knife was by cutting bread, confidently saying, “Giko Giko wa Shimasen” (“There’s no need for a sawing motion”). But ironically, he was moving the knife back and forth like a saw.
People use this meme whenever they themselves are sawing back and forth.

You are now certified in Japanese meme culture, congratulations!