slap in the face 1 n. An insult; a disappointment. We felt that it was a slap in the face when our gift was returned unopened. Doris thought it was a slap in the face when her boyfriend invited another girl to the dance.
Compare: KICK IN THE PANTS.
slap in the face 2 v. phr. To insult; embarrass; make feel bad. John slapped our club in the face by saying that everyone in it was stupid. I don't want to slap her in the face by not coming to her party.