1. To shove, cram, or pack something down into something else. A noun or pronoun is used between "stuff" and "down." The criminal stuffed the bag of drugs down his pants when he saw a police car approaching. She ripped up the subpoena in rage and stuffed it down the garbage disposal.

2. To eat something very quickly or voraciously. A noun or pronoun can be used between "stuff" and "down." I felt sick after stuffing down that entire pizza all by myself. I used to be able to stuff a pint of ice cream down and not gain an ounce of weight. Now I gain five pounds just thinking about ice cream!