Stitch

A stitch as in "stitch incoming" refers to a TikTok mechanic where the author first plays a different video in fullscreen before inserting theirs. The TikTok editing tool used is called 'Stitch' because it helps 'stitching' video's together. To avoid their audience from skipping the video because they do not recognize the authors post, the author puts the warning "stitch incoming" over the copied video.

"I didn't recognize it was his post because of the stitch."