pop down
To go someplace very quickly or briefly that is either on a lower level or is some indeterminate distance away. I need to pop down to the store for some milk—do we need anything else? We just moved in on the floor below—you should pop down sometime! We were in this part of town, so I thought we'd pop down for a visit.
pop down (for a visit)
to come or go to someone's home that is downstairs or in a place on a lower level. You simply must pop down for a visit whenever you get a chance. I'll try to pop down tomorrow evening after dinner.