Explode (as in "boom") no, but yes the stomach can rupture (rare and usually associated with competitive eating situations).
A few years ago hubby and I watched a documentary about a tribal community (Africa I believe) which holds an anual "weight gain" competition ritual (men only). To win is quite an honor and sign of status (verification that the man's family and/or clan is wealthy enough to provide the food and to do without the man's labor during the several week competition).
The men who enter the contest do as little as possible (to burn the fewest calories - they lie on mats and their relatives bring them food and milk to drink). Participation in the ritual is considered a sign of bravery too, because deaths from the stomach rupturing occur frequently enough that during the ritual the participants and their families talk about the men who have died in the past. It's considered an "honorable death," because it's done for the good fortune of the clan.
I tried to google to find the name of the documentary, but I could only find references to posts of other people trying to identify it as well, such as this one.
http://www.sherdog.net/forums/f5/afr...h-year-404836/