Despite rumors circulating on forums and clickbait videos, there is no official "Bubble Man" cheat code in Grand Theft Auto: San Andreas. The game's cheat list is extensively documented by Rockstar and the community—this code simply isn't part of it.
If you want to expand your San Andreas experience, use reputable modding communities like GTAForums, ModDB, or the official Steam Workshop (for the Definitive Edition). Avoid downloading executable files (.exe, .asi) from unknown YouTube links or file-hosting sites—they frequently contain malware.
Enjoy the game as Rockstar designed it, or explore the vast world of community mods safely. There's no secret "Bubble Man" code waiting to be discovered.