backmas 

After saying 'afk' or 'brb', you can use 'backmas' to say you're back. The -mas is from the word 'Christmas'.

Afk, gonna go eat dinner.

Alright.

(10 minutes later)

Backmas!

Welcome Back~

backmas by Beelzenef June 15, 2009

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

Backcase 

There are three different meanings for the word 'backcase'

- First it could mean a spine in a suitcase, this is the literal meaning
- The intent of 'backing up' a friend in a fight of some sort
or
- When your mate thinks they're hard so they cause a fight and then realise they're only talent is running so they ask their friend to have their 'backcase'

Friend 1 - Oh yeah mate, I'm gonna have a fight with _____
Friend 2 - Alright man I got your backcase
Friend 1 - Thanks mate!

Backcase by LazyLollipopGumdrops July 13, 2017

karmic backlash

When things go smoothly for a period of time and you're enjoying life, karma finds its way back to you and fucks things up.

I had the best November but I'm getting karmic backlash and December is turning out to be such a drag.

karmic backlash by Yana TV January 21, 2009

Backwash Cum

When you suck a guys dick, and you hold the cum in your mouth and then exchange it back to him through a kiss.

Damn that backwash cum tasted so good after last night.

Backwash Cum by 0dharpsand0flats November 27, 2019

sloppy backwash 

frenching after blowing a load in your girl's mouth.

I came in my girl's mouth and she asked me to sloppy backwash her, but I said HELLLL NOOO!!

sloppy backwash by Not kinky November 3, 2007