Pulling a Niagara means to apply to only one college for an undergrad and be accepted. This can also be applicable to grad school.
John: Hey, do you know how many schools Mary applied to?
Kelly: Nah, she pulled a Niagara.
or
Dan: Do you think I should pull a Niagara and apply only to Princeton?
Cole: Nah, its risky. Apply somewhere else too.