In Meet the Parents we never got to meet Greg Fockers parents. It wasn't until Meet the Fockers that we were introduced to Bernie and Rozalin Focker. They were played by Dustin Hoffman and Barbra Streisand.
It means she's a keeper. Any girl who invites you to meet her parents respects both you and her parents. She wants you to have an idea of how she lives and she wants her parents to (1) get to know you, and (2) give her the "okay" to be with you. It's a good thing.