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1.
100% sure of it. Without a doubt. This slang is mostly used in Australia.
Babe Ruth is a deadset legend.
av Puzant 9 december 2003
 
2.
Dead set basically means 100% serious, or not joking. it can be used as a question also. Commonly used by Australians.
1)
That guys a dead set fucken poof.

2)
Robert: Yesterday I totally flipped out and killed 100 pirates with my boner, and then wailed fucking HARD.

Some Idiot: Dead set!? WOW I AM PUMPED UP!!
av BLuFFaLo 3 maj 2007
 
3.
Predoninantly Aussie slang, used to enforce the certainty of ones opinion.
Often used to enchance harsh assessments of the character of others.
Dave: "That guy over there is my new boss. He is a fuckwit".
Robbo: "That bloke? He looks like a deadset fuckwit to me".
av Jas the Aussie 6 november 2008
 
4.
A BBC thriller television series about a zombie outbreak in a Big Brother house. Using surprising special effects, it deals with all zombie movie stereotypes in the first episode and allows for the excellent plot to develop itself in the next 4 episodes.
Dead set: one of the opening episode’s most delicious moments comes when a housemate, confronted with the fact that the world outside is in zombie meltdown, whimpers forlornly, “Does this mean we’re not on telly any more?”
av TNTom 9 april 2009
 
5.
The word used to describe the kind of scene of total and utter desolation, desomation and isolation. Usually uttered to either oneself or to a friend upon the arrival to a party that noone went to/everyone has already been to a totaled the place.

Taken from the British TV drama Deadset, in which the cast find themselves alone in the middle of a post-apocolyptic wasteland dressed in drag and not nearly crunk enough.
"Ah man, Jas' party was a total deadset, no drink, no drugs and nobody even showed up."
"Didn't stop you from projectile vomiting and stealing a TV though did it?"
"Heeeell no."
av KEEPING 20 december 2008