The Slapping
Scholars have said that whoever sees themselves slapping a person in a dream, this may indicate that they are offering them admonition or advice. The vision might suggest an attempt to alert that person and awaken them from their heedlessness.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam
Note: These are traditional scholarly interpretations (ijtihad) drawn from a specific classical source — not a binding religious ruling, fortune-telling, or a prediction of the future.