How would you define

OP, why do you ask, is it in reference to something written? Can you show it to us?

SJG

lips only slightly parted, no tongue, lips only lightly touching, dry. If there's any noise, it's the friend-kiss noise

Versus, says, DFK: mouth open however much, tongue, wetness, more pressure between lips, maybe playful nipping. If there's noise, it's slurpy noise