So, in desperation, I ripped off a corner of the New York Times that I had been reading earlier, and crumpled it up and stuffed it inside of my cup and put it back in its pouch and hoped that my roommate wouldn't smell the smell and investigate.
I just did a smell-test (about 12 hours later), and it is wonderful again! It's got that new-cup smell and I am happy. There's a little bit of ink residue that I'm hoping will go away when I get a chance to boil it this weekend, but I just wanted to let you guys know that if your cup is stinky, newspaper seems to work like a charm! =)