Used in place of lube - slube is the naturally occuring lube our body produces straight from the saliva glands. An ample amount is place in the palm of the users hand an applied quickly and generously to get a groove on. ie sex and/or masturbation
Pat used so much slube he came quite easily without any rash or chaffing.
Derrick quickly realized he wasn't going to get any ass because this bitch was tight. He used his slube to get that in and triumphed on bis birthday.