Oh "hit" means the attack successfully reached the damage and effects step. You don't even have to deal damage, unless that's a separate stipulation of the effect. If you do deal damage, it is done all at once. Damage is done before Effects happen though. There was at one point a discussion whether damage and effects were simultaneous, with the consensus leaning towards they were, but it has since been decided that damage happens first. This just works better for a lot of things. For example, Corrode.