smack in the face
A set phrase used to describe words or actions that have offended or otherwise upset someone. It was a real smack in the face when she got promoted over me, especially after the amount of work I did on that last project.
smack in the face
Fig. something that will humiliate someone, often when it is considered deserved; an insult. Being rejected by Jane was a real smack in the face for Tom, who thought she was fond of him. Meg thought she was the best-qualified candidate for the job, and not getting it was a smack in the face.
a smack in the face (or eye)
a strong rebuff. informal