Meat damage is one of the three types of damage that a Runner can suffer. Meat damage is mechanically identical to net damage, requiring the Runner to trash one card from grip at random, but is caused and prevented by different cards from net damage. If the Runner takes too much damage, s/he can flatline.

Page 20, Column 2, Paragraph(s) 4, Core Rule Book
Meat Damage: The Runner randomly trashes one card from his grip for each point of meat damage done to him.
Page 30, Column 3, Paragraph(s) 1, Core Rule Book
Damage, Meat: A unit of damage that requires the Runner to trash one card from his grip at random.
Community content is available under CC-BY-SA unless otherwise noted.