big back

1) someone that loves food and eats a lot, basically a foodie.
2) someone that quite literally has a big back.

1) "I'm so hungry!"
"Didn't you finish a whole bowl of Chipotle like thirty minutes ago?"
"It didn't really fill me up."
"Okay, big back."

2) "I do a lot of lat pulldown whenever i'm at the gym."
"Oh, so that's why you have a big back?"