15 is said to be the number of pounds that many students gain in their first year of college; and freshman 15 is the often observed phenomenon of weight gain among first year college students.
Holiday pounds refer to the extra little bit of weight you put on during a period of being on holiday or vacation.
Holiday pounds指休假或者節假日期間額外增長的那部分體重,我們可以戲稱為“假期胖子”。
For example:
Man, when I get back to work I'll have to start going to the gym again- I've put on some serious holiday pounds.
Like college freshmen who get fat from too much dorm food and too little activity, many cubicle potatoes lead very unhealthy lives. They have erratic eating habits and indulge in too much late-afternoon or late-night high-fat snacking. They are only half joking when they say their only physical activity is surfing the Internet.