Smack is a great word.
You can smack (hit)someone with your hand or something else.
You can smack your lips when you see something tasty you'd like to eat. (Make a noise by pressing and releasing your lips quickly)
You can give your sweetheart a little smack (kiss) on the lips. (Very casual kiss)
You can run smack (directly) into the edge of a table.
You can also smack yourself on the forehead, if you forget what smack means.