The door next to yours or next to the one being talked about. It could be adjacent, it could be above or below, across the street... so long as there are not other doors in-between.

Usually refers to the building that the door belongs to, often which is a home.
Nick lives next door to David on Downing Street. David's place is number 10 and Nick's is number 11.

Out in the countryside, Mr Eavis's farm has a border along a long road. Mr Park's farm is on the other side of the road. Their farms are next door to each other.
by natts November 13, 2013
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This is similar to the girl next door concept of routine feminine attractiveness only cuter and livelier!
Yes, Susan is a fine woman, she grew up as the cheerleader next door!
by I, Wreckerrr December 4, 2020
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In a crowd full of dude-bros, bad-boys, geeks, jocks, and punks, the boy next door tends to end up overlooked. He is unassuming in appearance and behavior. Introverted, quiet, and in some cases, extremely shy. Most would probably just describe him as 'your typical boy'. On the surface, no one extraordinary. Just a minor character in the cast of your life.

Only, when you look closer, he's so much more. His unassuming nature has made it so that his incredible talents are generally unknown to his peers. In reality, he's brilliant, contemplative, and has some kind of hidden talent. As it turns out, he's very clever, giving him a rarely-found mature sense of humor.

Something else that is overlooked: his appearance. You won't notice if you don't look quickly, since he won't draw attention to himself with loud words or loud clothing. But his face is something special. His features are balanced and symmetrical. His skin is clear and smooth. His hair is soft, and so are his eyes. His eyes make your heart skip a beat. His modest smile makes your insides churn. He’s beautiful.

One thing you do know about a boy next door from the beginning that remains true upon closer examination is his purity. He almost definitely is a virgin, and likely hasn't even had his first kiss, either. He’s waiting for the right girl, the one he wants to spend the rest of his life with. And when you’ve gotten to know him, you will want to be the one he falls in love with.
You: So I'm going on my third date with Mark this weekend. I'm thinking about going exclusive with him.
Friend: What? I didn't even know his name before he asked you out! He's totally boring! Shouldn't you be after someone with drive and charisma, like Gavin?
You: You haven't gotten to know him. He's actually a total boy next door!
Friend: No way! In that case, you gotta hold on to him as tight as you can!
by kickbocksir April 21, 2018
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The skank in a suburban neighborhood who chases after another woman's husband.
It was a great party until the whore next door showed up...uninvited!
by Ms. Sunshine April 3, 2008
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The boy next door is a young male stock character who is often used in romantic stories. He is so named because he often lives next door to the protagonist or is a childhood friend. They start out with a mutual friendship that later often develops into romantic attraction.
by astrologygf June 3, 2021
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A teenage male, very wholesome and unassuming, and maintains an innocence about him. Very sincere, sometimes shy, sometimes confiedent and rarely arrogant. A sweet boy, someone who girls are proud to bring home to their parents because of his charm, demeanor and sincerity. Very innocent when it comes to romance, almost always a virgin.
Topher Grace in "Win A Date With Tad Hamilton," a great example of a boy next door
by Rusch April 11, 2007
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