He was obviously involved in a bet regarding whether his buddy could get a pair of Sandra Bullock's undies. If he lost, he was going to have to eat 3 raw ducks. When his buddy didn't come back in time, he ate the first raw duck. His friend saved him from having to eat the other 2 when he showed up with Sandra Bullock who was, of course, wearing herundies.
It was judged a partial victory and he was released from having to eat the other ducks.
The missing subhead supplies the information that he was a stoner who’d recently had several bong hits of habifropzipilops harvested from the grave sites of Tibetan monks on a full moon. He got the munchies so bad that he ate an uncooked rubber ducky. He would surely have choked to death had not Captain Underpants saved the day, so soon after having learned the Heimlich Maneuver.