If something is good reffering to when you slpap the table or your hands when something good is happining.
(if someone say you are gonna go on holiday) 'Ahh man that is slapp'n.
'THis tripis gonna be so slapp'n.
It can just be said by itself 'Slapp'n' this means cool or you are happy
meaning cool, tight, or off the hizzi fo shizzi
son that party was slapp'n