Islamic Interpretation of Dreams (Ibn-i Sirin):
(Striking) Slapping someone on his cheek in a dream means cautioning him or warning him about his heedlessness.
If a woman gently slaps her own cheeks in a dream, it means glad tiding of a son she will conceive at an advanced age, or after havinglost hope in conceivingchildren. However, slappingsomeoneâs face in a dream also could mean injustice, an illness, or cold.
(Also see Slapping on the cheek)