This is a dumb little gag. The little boy is forbidden by his mom to go on the big cool slides and has to stick to the little wee ones. He obviously thinks that's lame and needs to sneak away. Apparently his best option is to jump into a fat chicks ass and he's willing to go that distance....plus he gets to snag her burger for good measure.
So, here's the ending. After all hell breaks loose, the water park completely floods and everyone is served as a hot meal. Like any good shark movie (Jaws 2, Jaws the Revenge, Deep Blue Sea, Batman(1966)...well none of those are really good at all, but they all have a token helicopter scene which somehow involves a shark attack. Here, we have the cops show up to save the remaining survivors who are all in a huge clump hanging on for dear life to the chopper. The 'Head Honcho' decides to jump onboard and fling everyone to their death (women and children first) to save his own ass....but in the end, he gets it, big time.