Does "Freshman 40" refer to the 40 lbs. which a college freshman invariably loses after leaving home - incl. saying "good-bye" to Mom's cooking, losing unlimited access to a well-stocked larder, etc. - and being forced to "make due" on a small food budget, improvised meals, etc.?
Then I know what you're talking about.
Regards,
When I was in university, “Freshman 40” was when the girls chunked out in their first year of college. Away from home, they pigged out in the student cafeteria and in their dorm rooms.