(1)When a male rubs the head of his penis on a the lips of a females virgina, just to making her horney and wet.
(2) When a person is just hanging out at home or with the homies.
(1)Damn son i was hella hydroplaning that hoe seema's pussy last nite, made that pussy hella wet.
(2) Wat you doing son? " nuthing B just hydroplaning.