Islamic Interpretation of Dreams (Ibn-i Sirin):

(Blow; Criticize; Smack) To lightly slap someone in a dream means to reprimand him, or to oblige him to recognize a favor, boasting about one’s generosity, or constantly reminding the other person of some shabby assistance.

Ifone playfully slaps someone lightly on his cheek in a dream, it also means that the latter owes him something or a favor and the opposite is interpreted accordingly.

Slapping someone’s face with anger in a dream means that the victim will triumph over the assailant.

To slap someone in a dream also means recognition of his seniority or superiority.

Threatening someone in a dream also maybe a recognition of his superiority.

(Also see Digging up the past; Slapping; Threat)