PARIS: Okay, I swept the room and I have to tell you, all sad. I think we’re a lock.
RORY: Really? I actually thought the locker alarm was pretty good.
“We’re a lock”, American slang meaning “we’re a sure thing, we’ve got this”. It seems to originate from American football, and to date to the 1980s.
Rory seems to have a much more realistic idea of their chances of winning than Paris does, although she looks pretty confident as well.