the boy next door
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the girl/boy next door
1. An ordinary person from typical circumstances, as opposed to someone with an elite or exceptional life. With the accessibility of technology now, the next billionaire could be the boy next door—you never know!
2. A (typically young) person with whom one is familiar, such as a neighbor (hence "next door"), or who exudes such familiarity, and who exemplifies a certain stereotype of wholesomeness, approachability, and well-roundedness, while perhaps being a source of latent romantic attraction due to a fondness resulting from such familiarity. Interpretations vary as to what exactly makes someone fit this description. Mary was always the girl next door, but when I came home from college I realized I was in love with her.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
the boy next dooror
the girl next door
If you describe someone as the boy next door or the girl next door, you mean that they are pleasant and ordinary. He was dependable, straightforward, the boy next door. She was the girl next door type.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
the boy (or girl) next doora person or the type of a person perceived as familiar, approachable, and dependable, typically in the context of a romantic partnership.
Farlex Partner Idioms Dictionary © Farlex 2017