Bacid 

noun. A word to use when you have absolutely no idea what you are talking about.

WOMAN 1: "B-A-C-I-D"

WOMAN 2: "What is a bacid?"

WOMAN 1: "B-A-C-I-D"

WOMAN 2: That doesn't mean anything to me.

WOMAN 1: "B-A-C-I-D"

WOMAN 2: It doesn't matter how many times you spell it, it still isn't a word!

Bacid by BS/KH December 2, 2011

Backdoor Season 

A season or interval of time in which Tragic events or betrayals occur over the span of the season with words like "shit get tragic" used to announce these events, additionally one may ask "what was the reason" to try to better comprehend the tragic event that just took place.

"Bro shit get tragic, Backdoor season"
"Bro is Backdoor season you know shit finna get tragic"
"Oh shit its Backdoor season Shit get tragic like what was the reason"

Backdoor Season by blumast164 May 17, 2023

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

Backdoor 

To go behind someones back and betray them

Mike accused me of trying to backdoor him and talk to his friend

Backdoor by 1kblack October 18, 2019

Backdoor 

When the location of an unsuspecting person is acquired, typically through their “friends” or a girl they might know. This location is usually given to the opps in order for this unsuspecting person to be set up, robbed, and sometimes killed. Lil Durk on his feature for “Top” says “Your close homie’ll try to Backdoor you if you let him”

Person 1: Bro U gotta watch your back I heard your brothers been tryna set u up

Person 2: My own homies tryna Backdoor me? Fake ass niggas man!

Backdoor by CloseThatBackdoor January 25, 2021

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

backdoor bragging 

Backdoor bragging is when you sneak something wonderful about yourself in everyday conversation.

30 Rock Episode Dialogue:

Kenneth: The personal essay is way harder than I thought, cause it's not in my nature to brag on myself.
Jenna: Not even a back door brag?
Kenneth: What's a back door brag?
Jenna: Backdoor bragging is sneaking something wonderful about yourself in everyday conversation. Like when I tell people it's hard for me to watch American Idol cause I have perfect pitch. You try it.
Kenneth: Oh, it's hard for me to watch American Idol because there's a water bug on my channel changer.
This comes back later in a talk with Liz:
Jenna: People always underestimate my instincts because of my good looks.
Liz: This is no time for back door bragging!

backdoor bragging by David Ward May 30, 2008