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A person who is capable of eating way more food than external appearances would suggest.

A remorseless eating machine.

This is a modification of the astronomy term describing the center of a black hole, wherein space/time curvature becomes infinite. The infinite mass of the singularity sucks in all sufficiently near victims.
At 5'8" and 165 lbs, Takeru Kobayashi is a gastronomic singularity as evidenced by his eating 64 hot dogs in ten minutes.
by HHMTB June 02, 2010