Backday 

The day before yesterday

I came back from over seas backday

Backday by Word genarater May 27, 2021

Koopa-Backdash-Wave-Slide-Hover-Walk-Moon-Landing 

In Super Smash Bros. Melee, characters who's walk-acceleration is lower than their traction value after wavelanding backwards can buffer a slight walk forwards to decrease the momentum lost. The walk input must be at its lowest value to perfectly execute the tech. (rough translation of inputs) Characters with low traction (Luigi) benefit worse than those with higher traction values in Melee. (i.e Gannondorf can benefit from the Koopa Backdash Wave Slide Hover Walk Moon Landing more than Luigi in terms of distance)
Youtube has more info on this.

The Koopa-Backdash-Wave-Slide-Hover-Walk-Moon-Landing can make virtually anyone feel like they are playing on ice.

Koopa-Backdash-Wave-Slide-Hover-Walk-Moon-Landing by Do_mmar September 11, 2020

korean backdash 

An advanced defensive meneuver created by the Chaiwanese. This technique requires a person to dip their head and shoulders while stepping backwards to avoid being physically hurt. Often done multiple times in succession.

Aris flew into a hotdog fueled rage after his attacks were thwarted by a masterful dance of korean backdashes.

korean backdash by vicnuggets May 30, 2018

National arch your back day 

June 1st , walk around with your back arched like some flat girls at school. Because it’s what you guys are best at archin dat shit

“Hey it’s national arch your back day act like the thots !”

National arch your back day by Hotjalapeño May 21, 2019

tun' backway

(Of Caribbean origin) Literally, to "turn backway".
To position oneself to receive cock from behind; for doggy style.

A dance position that entails a girl bending foward, while her partner daggers her, emulating the doggy style or back shot position.

"Aye baby, tun' backway let me give it to you hard"
"In the party last night Janet was only tunnin' backway; she must really like that position"

tun' backway by ( - ( -_ ( -_- ) _- ) - ) July 20, 2009

hardcore backdance

A hardcore dance often done in the pit at a show during the breakdown of a screamo song.
It consists of two people standing back to back while linking arms.
One person bends forward, holding the other person on their back. The other lifts their legs up and kicks violently in the air.
The backdancers take turns doing this as many times as they please.
Sometimes the hardcore backdancers spin while doing this as to kick as many people in the pit as possible.

A Hardcore backdance should not be performed by two people if one is a lot heavier or taller than the other.

Hardcore backdancing is distantly related to the backdance

Guy: Did you see those chicks do a hardcore backdance in the pit earlier?
Girl: Ya, I wish we could do that but I lack the upper body strength.
Guy: Yes, you're not nearly as hardcore as them.

hardcore backdance by Anafallsintoyourheart August 19, 2007

backdance 

a lap dance on the back. Someone sits down while another person attempts to give a lap dance to the back region.

It was orignally invented by Talia at Candace's 15th birthday party as a truth or dare joke.
After being created the backdance has formed spin offs such as the hardcore backdance and a song by the myspace band "The Weiner Dogs".
"Backdancing" is very popular in NOrthern california.

Talia: Truth or Dare
Heather: Dare
Talia: Give Timmy a Backdance.

backdance by Anafallsintoyourheart August 19, 2007