deadass

adverb

dead·​ass ˈded-ˌas 

slang

: in all seriousness : seriously

Deadass I've watched that Black Panther trailer at least 15 times.

—@NeoGameSpark, on Twitter

So Ivanka Trump was behind me in line at Starbucks this AM and I was reading and deadass didn't notice until she gave her order.

—@ellievhall, on Twitter

"Man, having André [3000] involved was a dream come true. The whole experience of working with him side by side on something so amazing is deadass hard to fathom."

—$ilkmoney

Word History

First Known Use

1963, in the meaning defined above