1. Used rarely to convey your 100% certainy of a situation or question. No backing out if you say 'yeah fuck yeah' to a quiery. Upmost form of agreement.

2. Also used in response to a phrase you agree with entirely.
1.
Al: Wanna come round and put my girlfriend on the spit?
Me: Yeah fuck yeah. (Now I must go do it)

2.
Me: Gravity hasn't found that ass yet, hot as.
Al: Yeah fuck yeah mate
by henrybomb November 8, 2005
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A commonly used phrase with South Australian origins, it is difficult to strictly define what this means. It is a statement often made during the course of a large night out, and can often make or break the night.
Joe sees Anton after finishing voiding his bladder and walks up to him, slaps him on the back and shouts "Yeah, fucking YEAH!". Anton just grins, and knows in his heart that this is going to be a great night.
by undie-hoover-man December 27, 2010
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The ultimate way to agree with someone having said "Fuck yeah" in a conversation. Simply saying "Hell Yeah" to their previously stated "Fuck Yeah."
Dude at gas pump #1: "Damn, the Rangers are kicking some ass this year"
Dude at gas pump #2: "FUCK YEAH"
Dude at gas pump #3: "HELL YEAH, FUCK YEAH"
by ComancheGap June 11, 2015
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