Flim13 could have been the handle of a single, prolific uploader who created a series of POV (point-of-view) sketches where the camera acted as the teenager, and an off-screen actress played the titular friend's mom. If the channel was deleted during one of YouTube’s massive purges in the early 2010s, the memory of the videos would survive only in comment sections, turning Flim13 into an urban legend.
Understanding the convergence of indexing technology, behavioral psychology, and search algorithms explains the persistence of specific search strings like "flim13 my friends mom" in digital traffic reports.