1. noun. One who warrants slapping one's head in frustration over. example 1. Sometimes this can be used in the first person. see example 2
2. noun. One who merits a sound slap on the head. An idiot. see example 1
3. verb. The action of slapping one's head in frustration over the actions of another (or one's self).
1. "He is a complete and utter Slaphead"
2. "I am such a slapead."