A hard, stinging slap on the ass, the kind that starts a fight amongst boys in the locker room. If it is a softer tap, it becomes a dry slappy.
Damn Jackson that was a hard wet slappy!
A soft tap on the ass. A friendly greeting, among peers. It should be reciprocated, or the slapee should thank the slapper graciously. If it's a hard hit, it becomes a wet slappy.
Thanks for that dry slappy Jackson.