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side boob

American  
[sahyd-boob] / ˈsaɪdˌbub /
Or sideboob

noun

  1. Slang: Sometimes Vulgar. the outer curve of a woman's breast when revealed by clothing cut low under the arms.

    She's flashing too much side boob.


Usage

What does side boob mean? Side boob refers to when a sizable portion of a woman's breast is exposed from the side, as often happens when someone is wearing a tank-top without a bra or a revealing evening dress. Content warning: the following content includes references to sexual content.

Etymology

Origin of side boob

side 1 ( def. ) + boob 2 ( def. )

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

One door leads into a side room in the Manchester mental health unit where she's a patient.

From BBC • Oct. 21, 2025

Now, though, as we all sit together in this quiet side room, the guys are fully Tapped in as the fictional band members, focused on the expectations surrounding this forthcoming film.

From Los Angeles Times • Aug. 20, 2025

She excused herself and stepped into an empty side room to collect herself.

From Slate • Jan. 13, 2025

I ended up in a side room like that too.

From BBC • Aug. 6, 2024

The girls from my barracks have made this little side room into a bridal suite, with glasses and teapots full of flowers.

From "What the Night Sings" by Vesper Stamper

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