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100% sure of it. Without a doubt. This slang is mostly used in Australia.
Babe Ruth is a deadset legend.
Deadset by Puzant December 9, 2003
Related Words
The term used to refer to the corrupt corporatized internet used till the 2020s before its "death" at the hands of the general global revolt against all forms of socio-economic, religious and political corruption. The internet increasingly came to be seen as a tool of government indoctrination, increasingly distrusted. Rebel techs began experimenting with peer-to-peer technologies to create a decentralized system of information exchange over large regions.

Eventually these competing internet systems were synched up into a single collective-managed standard known as the Alternet. Once the stateless Alternet system went global, a new politico-economy was forged to effect DIRECT DEMOCRACY.

This finally abolished the oppressive one-metric capitalist and socialist systems of old, both of which benefited only an unseen global elite. It also did away with the ineffectual political system that employed middlemen know as "politicians" to represent people only indirectly. It was by this point then that sociopathy could finally be isolated and treated early instead of allowing the few to cause mass suffering on the many. The purging of this large-scale corruption finally cultivated massive innovation in ecological management which if left unchecked would have ruined the planet's ability to support most forms of life including our own.

The term also alludes to the global holocaust of the poor during the height of the system, at its downfall and during the societal chaos that ensued.
I can't believe people in the turn of the century put so much blind trust in the Deadnet in the days of corporatism. How did it get so bad? I'm glad we made it.
deadnet by gregjockca November 18, 2011
When your ex dumps you, he ain't daddy anymore you ain't fuckin wit him so he's deadie
"How's your bae Jason?" "oh him? we broke up he's deadie"
Deadie by BitchPickles April 7, 2019

Deadset gee up 

A phrase used in some parts of Australia by Bogans that watch Rugby League.

example;

a)Hey do you know Souths beat Brisbane?
b)No way! Did they?
a)Of course not.
b) That's a deadset gee up, that'll do me.
Deadset gee up by Jango Fett August 6, 2006
A human, animal, or object that has been possesed by a disembodied Kandarian demon. The inhabited host will display massive abnormalities physically, as well as supernatural abilities such as levitation and voice throwing. They also can infect another host by biting them. To dispose of a deadite one must blow their brains out with a shotgun, or dismember the host's body, always making sure to destroy the brain.
Ash quickly realized the deadite was playing dead and told Aurthur to get an axe.
deadite by Lungs311 July 13, 2007
Deadset is an Australian slang term for being serious.
Derives from the Phrase “I’m serious “

Meaning to be serious.
Mate deadset I will pay you back”

By Isaac
Deadset by Mr_Fitz February 20, 2018