Deadset

100% sure of it. without a doubt. this slang is mostly used in australia.
babe ruth is a deadset legend.
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 f-cken poof.

2)
robert: yesterday i totally flipped out and killed 100 pirates with my b-n-r, and then wailed f-cking hard.

some idiot: dead set!? wow i am pumped up!!
predoninantly aussie slang, used to enforce the certainty of ones opinion.
often used to enchance harsh -ssessments of the character of others.
dave: “that guy over there is my new boss. he is a f-ckwit”.
robbo: “that bloke? he looks like a deadset f-ckwit to me”.
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?”
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 n-body even showed up.”
“didn’t stop you from projectile vomiting and stealing a tv though did it?”
“heeeell no.”