Top Definition
When renting a large apartment a person may need to share the rent with several people. They will share with a friend but may find that simply spliting the rent will not be enough so they need a third person...just anyone who will pay. The third girl.
Uh-oh, money is getting tight...we need a third girl.

But who?

How about what's-her-name we sorta know?
I guess...but get the money up front
by Thatron July 18, 2010

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