It is a strong way to express a lack of concern or complete indifference toward a situation, opinion, or person.
On video platforms, the tag combined with this phrase often identifies content with the following themes: What does aha wiem i mam to w dupie;) mean? - HiNative W dupie to mam #shorts
A slightly less vulgar but still slang version is "mam wyjebane" (I'm totally indifferent). A polite alternative is "nie obchodzi mnie to" (it doesn't interest me). Context in Social Media (#shorts) It is a strong way to express a