Hi horsecrazy,Dumping is when your stomach empties into your small intestine too quickly. Here's a Mayo Clinic definition and information:
http://www.mayoclinic.com/health/dumping-syndrome/DS00715
When I was recovering from my Nissen three years ago I had some dumping syndrome symptoms. It never gave me any of the side-effects described...just loud grumbling and stomach noises, and then a bout of diarrhea. It usually only lasted about a day, but could repeat from time to time depending upon what I ate and how my wrap was feeling.
This continued, though gradually decreasing through the year mark. I figured it as a surgery side-effect I'd just have to live with. However sometime during the second year it stopped completely. Go figure.
Hope that answers your question!
Denise