How to gain weight ASAP?

Hi, I'm a college student that just moved into the dorms, and I know this is going to sound pathetic, but between having to pay for food, textbooks and alcohol, I'm going to burn through my savings pretty quickly. I'm shooting out applications for work-study, but nothing seems to stick.

So I'm thinking of donating blood ($50 for each donation, twice a week), the only problem is that the weight requirement is 110 lbs, and I always hover around 105, I guess I have a fast metabolism. Are there specific foods to eat or should I just carry lead paperweights in my pockets when I walk into the clinic?
How to gain weight ASAP?
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