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In a picture posted on the GameFAQs forums by AlienNine, of his girlfriend's back tattoo, there appeared to be a boob on the back, slightly below the arm.. Yes, a boob on his girlfriend's BACK. Of course, even the dumbest little 12 year old could figure out that it's fat, but...we JUST don't care. Since that day, the "back boob" has become the new...well, the new "confirm/deny". That easy.
Dude, $5 a frieken back boob!
back boob by Anemic Royalty September 20, 2006

Back Boobies 

A condition that occurs when someone is chunky enough, a bra will sink into their back fat forcing unsightly flaps of skin to protrude over their bra strap creating a floppy "boob-like" formation in their shoulder-blade region. This condition is well documented in smaller towns where there are ample supplies of bacon. It has also been known to correlate directly to a FUPA.
That bitch must be trying to counter-balance her Double D breasts with her C Back Boobies.
Back Boobies by Narcolepticjay August 28, 2006

back-boobs 

When someones shoulder blades are sticking out of their back in a way where they look like boobs/breasts.

This could either happen when they are stretching or standing in a awkward position, or when someone is rather skinny.

On the other hand, it might also refer to people who are obese and have pouches of fat on their back beside their shoulder blades that have the shape of boobs.
Eg1: Elle is becoming so skinny. Yesterday I saw her stretching in the locker room and from the back she looked like she had back-boobs

Eg2: Roohx could you please PhotoShop my back, my shoulders look weird. I look like I have back boobs.

Eg3: Poor thing, she really should wear such tight shirts when shes that large, her back boobs are really popping out there.
back-boobs by MrBigG August 3, 2011

Back Boobs 

When an individual is so obese that when viewed from the rear the rolls make it look like there is a set of tits on thier back.
I was in wal-mart the other day and I was walking behind a chick so fat she had DD size back boobs.
Back Boobs by The Haagimus October 23, 2009

Back Boobs 

Sometimes an individual is so fat that the rolls of fat on their back become strange, breast-like appendages. They have a bizarre, hypnotic power. Even though you are mildy repulsed, it is hard to look away once you see a real pair of beauties jiggling like there's no tomorrow on someone's back.
1. Cheryl: Man, check out the back boobs on that femullet! Those have got to be double D's.
Brigid: At least!

2. Jenna: Thank GOD I don't have back boobs!
Cheryl: ...YET!

back boobs 

When someones shoulder blades are sticking out of their back in a way where they look like boobs/breasts.

This could either happen when they are stretching or standing in a awkward position, or when someone is rather skinny.

On the other hand, it might also refer to people who are obese and have pouches of fat on their back beside their shoulder blades that have the shape of boobs.
Eg1: Elle is becoming so skinny. Yesterday I saw her stretching in the locker room and from the back she looked like she had back-boobs

Eg2: Roohx could you please PhotoShop my back, my shoulders look weird. I look like I have back boobs.

Eg3: Poor thing, she really should wear such tight shirts when shes that large, her back boobs are really popping out there.
back boobs by MrBigG August 3, 2011