This comes from use of the ‘stitch’ feature on
TikTok which allows users to respond to small sections of other videos by adding (stitching) their own video.
When you first
see such content, the initial video may be triggering or seem to be contrary to what the creator usually posts. To warn viewers and
stop them from clicking away, creators add the ‘stitch incoming’ caption to let viewers know to not exit the video too quickly, but, rather, to wait for the
bit that follows (usually a rebuttal).
It is used as a video caption, not in a sentence.
The
tik tok creator added the caption
Stitch Incoming to let us know that her video critique would directly follow the original
clip.