Definitions by Oh yeah yeah Oh yeah yeah

On a stack 

Phrase by twitch steamer xqc meaning that you’re serious, deadass, and it’s “for sure” or 💯 .

Guy 1: “Damn dude that girl god knocked the hell out in that fight”

Guy 2: “On a stack man, literally.”

On a stack by Oh yeah yeah Oh yeah yeah March 27, 2021

Sleeper 

It's boring. Puts you to sleep.
The term most likely derives from the twitch emote residentsleeper

"Dude, that new video game is so sleeper man. It was boring as hell ."

Sleeper by Oh yeah yeah Oh yeah yeah June 20, 2020

Dah 

[Will Smith' invented it.
Meaning from Cool to yes!.

Dah! It's 2018 Rewind!

Dah by Oh yeah yeah Oh yeah yeah January 20, 2019