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An abnormality where a boob grows on the side of the torso, usually under the shoulder.
If she lifts up her arm you can see her sideboob.
sideboob by Wrong Un January 16, 2009
Sideboob is the exposure of the outer side of a woman's boob, just below her armpit, typically in clothing.
Reuben was taken by the killer and got a face full of sideboob as she threw him over her shoulder - he most enjoyed the view.
Sideboob by HairyBaguette October 12, 2020

sideboob reel 

when watching porn and the paid porn ad on the sidereel disturbs your focus.
i wish obama would do something against those sideboob reels!
sideboob reel by obama... August 24, 2010

sideboob saddle bags 

The side boob fat of a large woman wearing a bra that forces the lat fat to hang like a tit
Girl 1: Whats going on with that girls side?
Girl 2: Dont you know overwieght girls have sideboob saddle bags?
Girl 1: Oh yeah I forgot

tasteful sideboob 

The breast on the side in public that makes you become erect in seconds
John: Steve's gf has some tasteful sideboob
John's gf: WHAT?!

Grandma's Sideboob 

Grandma's Side Boob is the IG account for a up and coming ceramics maker / social media influencer. Let's hope you're here for her and well.... not the other reason.
I slid into Grandma's Sideboob DMs to see if she'd look at this page. I'm concerned about opening up the floodgates though by making the page....