The side view of a female breast that is usually unintentionally exposed by a female wearing a loose shirt or revealing bathing suit. Arguably almost better than actually seeing a fully exposed breast, the sideboob is the "profile" of a breast without exposure of the nipple. The side boob gives you a great sense of what you are working with while also keeping it PG-13.
by EFP3 April 28, 2009

by Jeremy Robinson December 27, 2007

Sideboob is the registered trademark of a fashion line by the company Some Brand in Germany (www.sideboob.de). The name Sideboob originates from their renowned shirts with deep and wide side cutouts, which allow a view of the female and male breast seen from the side.
I love these SIDEBOOB Shirts, because they allow a nice view of her breast from the side. Show some side-boob!
by Zischerio August 30, 2013

by The_Kerse June 27, 2020

Chad: hahahaha the tv said boob
Chad's mom: What did we say about laughing at the word boob?
Chad: ur a fucking dumb whore that dozen love side boobs
Chad's mom: What did we say about laughing at the word boob?
Chad: ur a fucking dumb whore that dozen love side boobs
by arkenbarben September 25, 2020

When a female has large enough breast that when she has her shirt off and she is viewed directly from behind, you are able to see the sides of her breast.
While looking at the back of a female, her boobs are visible on the side. Thus, side-boobs are present.
by mle_39 December 3, 2007

When your chest is unsupported and you're boobs are exposed from the side, usually while laying down; gravity will take its course and allows the breasts to fall to the side of the body, occassionally exposing them.Occuring most often while wearing a tank top
"i just want to give you a warning before i go to sleep....sometimes i get side boob"
"whats side boob?"
"sometimes my boobs fall out the sides of my tank top"
"whats side boob?"
"sometimes my boobs fall out the sides of my tank top"
by e-pot September 24, 2008
