What's on your mug?

A term David Dobrik and his close friends from Vernon Hills, including Ilya, use as an alternative to "swear to god".

David: *heugh heugh heugh* (mimicking how a clown laughs at the start of every sentence), deadass? you're gonna let me watch you have sex? Ilya: *heugh heugh* (tries to mimic David's laugh but fails terribly and uses his thumb to touch the tip of his nose and act all suave and slick while bobbing his head back and forth not realising his bff manipulated him), yeah *heugh*, deadass man.

By b99lover

The more gen z way or "slang way" of saying serious.

I'm deadass gonna slap you if you don't like this definition.

By deware

An insult directed at an individual to highlight their inability to perform a simple task or or otherwise learn from their mistakes and surroundings. One who has the mental acuity of a corpse's ass. Not to be confused with the adjective dead-ass or dead-pan which describe the seriousness with which someone emotes or conveys something.

Person A: *pushes on door clearly marked "PULL" * Person B: *waits frustratedly behind Person A * Person A: *looks at sign... pushes harder* Person B @ Person A: I think it's a pull not a push, friend. Person A: I know.. *Grunts while pushing on door* Person C: *Walks past person A and B, pulls on door and exits* Person B: *stares as door slowly swings shut in front of them... continues pushing" Person B @ Person A: DEADASS!

By Cuddle-scut

When you wanna end someones career in any argument, just do this one step yell DEADASS then problem solved.

"Did you drink my fucking juice last night? DEADASS" "You're a fatass DEADASS"

By SwampyAsser

When someone is painfully stupid and has near to no life prospects.

Person 1: Hey, why are you getting annoyed at me Person 2: Because you a deadass

By divine.solace