There is no widely recognized viral video or documented meme by this exact name in mainstream media or common social databases. Given the explicit nature of the title, it may be:
A file name from a specific device or personal collection. My Grandpa and Pops Are Fucking.mp4
If you are looking for information on why people use these specific nicknames, "Pop" and "Pops" are commonly used as affectionate terms for both fathers and grandfathers, depending on regional and family traditions. There is no widely recognized viral video or
Occasionally, users create absurdly named files to confuse others or as part of a very specific online subculture (e.g., "shitposting"). My Grandpa and Pops Are Fucking.mp4