This comes from the movie "Munich" by Steven Spielberg. The context is a bit lacking because the conversation takes place between two extras in the movie who are sitting at the bar while the main character is looking at someone across them.
"I take it she'd eat you up a bit, huh? You old dog"
"eat up" 3. To thoroughly enjoy something. When anyone showers the baby with love and affection, she just eats it up! Great job on the presentation—the board is going to eat it up.
Does it mean "I take it she'd enjoyed him a bit"?