You might not see a nut as an appetizing meal but another person who is really hungry can see that nut as a full course meal and make use of it.
It means that you shouldappreciate every nut that hits your stomach.
Person 1: Look at this sandwich... gross! Would you eat it if i gave it to you?
Person 2: Well, I am really hungry.
Person 1: I can't believe it! I guess one man's nut is another man's meal.
When men get together at an unnamed christian university, remove a majority of their clothing and eat pbj on hawaiian bread so as to be comfortable enough to talk about anything on their mind.