backfro 

The cluster of hair on one's back that looks like a bunch of spiders having a meeting.

Dude, that guy's backfro is so nasty, it looks like he is giving a monkey a piggyback ride.

backfro by Leroy Mansauce September 14, 2009

Backronym 

A backronym is an acronym constructed retrospectively to fit a word. The term was probably first used by Alan Chapman a business consultant based in Leicester England.

When used as an acronym good is actually a backronym.

Backronym by AKACroatalin April 18, 2015

background friend 

If you are a background friend:
You don't fit in with any particular group of friends.
They are all closer with each other than with the background friend
People who you think about a lot, but feel don't think of you very often.

I'm background friends with people in a large group from my favorite school/pub/university

background friend by Sotapana June 16, 2019

The backrooms

If you're not careful and accidentally teleport out of reality in the wrong areas, youll end up in the backrooms. Here, it is nothing but the stink of old, moist carpet, the madness of mono-yellow, the endless backround noise of fluorescent lights at maximum hum-buzz, and about 800 million square miles of randomly connected empty rooms where you are trapped. God save you if you hear something wandering around, because by that point, it already knows you are there.

Someone help, ive teleported to the backrooms.

The backrooms by Thanos Wang May 18, 2019

The Backrooms

The Backrooms is a realm that first appeared on 4Chan. This realm is out of the boundaries of the real world and can only be accessed by nocliping through a floor or wall in a place that inspires deja vu or an uncomfortable feeling of nostalgia. It consists of a never-ending maze of yellow-ish empty rooms with beige carpets, old wallpaper, the smell of mildew and moldy carpets, and the faint buzz of fluorescent lighting.

Someone please kill me I’ve been in the backrooms for so long I just want to die

The Backrooms by Madison Gomez June 9, 2019

Backrooms 

A really big yellow liminal office building that you get to by no-clipping IRL.

Person 1: Do you know where the backrooms are?
Person 2: In the wall.

Backrooms by smoorkcab June 18, 2021

Backtrolling 

An action taken by a person who is being trolled. The person being trolled uses the exact same trolling technique that the troll is using thus confusing the troll and making him look bad in front of everyone else.

He was trying to make me look like an idiot, but I pulled the good ol' backtrolling trick on him.

Dude, poor Toni always gets backtrolled by his friends.

Backtrolling by X-Ray Zulu May 6, 2011