Gas that

blowing something off, not doing something that has been proposed to you

Are you going to class today? Nah gas that, prof smells like shit

Gas that by bitchboi6969 January 21, 2018

gas that diesel down 

Common meanings:

To "drink an energy drink".
To get excited about something. To get prepared.
To be ready.

"I gassed that diesel down before this football game."
"I'm tired enough to gas that diesel down."
"Look at Tommy gassing that diesel down"

gas that diesel down by bigjumbo23 December 23, 2020

That Gas 

Good, Dank Ass Weed, Will get You Higher Then Hillary Clinton’s E-mail Deleted Box

I was gone off that Gas

That Gas by 87Dickhead49 March 8, 2019

Smoking That Gas 

Smoking marijuana (weed)

Guy 1: Bro I'm so high I've been smoking that gas
Guy 2: Wtf is that
Guy 1: I've been smoking weed

Smoking That Gas by Onnie.Wavy June 13, 2016

That Gas 

Really good

Cam Newton is that gas.

That Gas by JCLIKABOS October 2, 2016

that's gas 

Used to indicate something is cool, interchangeable with fire, dope, sick, etc.

Guy 1: I made an A on the bio test!
Guy 2: Bro that's gas, congrats

that's gas by Icy_with_it September 28, 2020

That’s gas bro 

I term used by “the cool kids” in middle school it either mean Good As Sh!t or mean something is lit or cool

You saw what that kid did that’s gas bro

That’s gas bro by Lil Chazzz December 9, 2019