A merker
The one who does the merking or the murdering, basically the human version of a food vacuum with a side of drama.
My roommate is a merker. She ate my soup, my sandwich, and my snack in one day.
He’s the merker of our group. He took my last donut and left me with a single crumb.
That guy is the merker. He ate my lunch and my dinner and still had room for dessert.