gurgitator
n. A person who competes in eating contests.
Examples
2006
One of the nice things about having dinner with Pat Bertoletti: You never have to feel as if you've overeaten, even if you make a complete pig of yourself. He's the nation's fourth-ranked competitive eater according to the International Federation of Competitive Eating (ifoce.com), which regulates and promotes the growing sport and last year doled out about $247,000 in prize money nationwide to top "gorgers," "masticators" and "gurgitators," to use eating circuit lingo.
—“Big-time eater,” Chicago Tribune, May 24, 2006
2006
And when it was over, there was greatness: The winner was tiny, 98-pound Sonya "The Black Widow" Thomas, who broke her old world's record and set a new one by scarfing 46 crab cakes in 10 minutes. …

Maybe you've heard of Thomas, who is 38, manages a Burger King at Andrews Air Force Base and is the darling — and No.1-ranked American "gurgitator" — of something called the International Federation of Competitive Eating (IFOCE) tour.
—Kevin Cowherd, “It's no gag when the Black Widow sits down to eat,” Baltimore Sun, May 02, 2006
2002 (earliest)
George Shea is president of the International Federation of Competitive Eaters, a Manhattan-based organization that sanctions events and tracks nearly 100 active ''gurgitators'' on the circuit. ''Long Island is a hotbed of eating,'' he said when asked why so many Long Islanders are world-ranked gluttons.
—Marcelle S. Fischler, “Champion Overeaters, and Proud of It,” The New York Times, January 27, 2002
Notes
This word is a trademark of the International Federation of Competitive Eating, and the trademark description lists a first use of December 13, 2001.