An adjective used to describe someone who appears vague or delirious. This may be through sleep deprivation, drug use, boredom or an innate, genetic wappiness.
Person 1: What the hell's wrong with that girl? She just garbled some nonsense then walked into a tree.
Person 2: Oh, Helen? She's a bit wappy this morning after staying up all night watching Spongebob and eating mini cheddars with James.
The act of slapping a bitch, hoe, or even a woman in the face with one's penis. Optimally, a Wappy Slappy is given with enough precision and force to leave a dark-purple bruise in the middle of the forehead, usually in the shape of a large mushroom, army helmet, or garden spade.
Man, you should have the mark that Wappy Slappy left on Jane's face last night. It looked like she had a picture of Papa Smurf tattooed on her chin!