It means you are about to do something, or more accurately you are doing something now that will lead to you doing the thing that you are fixin' to do. Fixing = preparation

Others here have the pronunciation wrong, when spoken it sounds like one word: "fixina" which led to it's child word finna
In the South we like to run our words together, it's too hot to pronounce every letter.
Texan: "I'm fixing to go unload my pickup cuz it's full of junk and I've gotta go get cokes for the party."
Translation: I am in the process of preparing to go begin unloading the miscellaneous items from the back of my truck because I must go purchase beverages for the party.
by chubbypunny August 20, 2015
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the event's been rigged and there is a conspiracy
I'm the key figure in and ongoing government conspiracy, the plot to conceal the truth about the existence of extraterrestrials. It a global conspiracy really, with key players in the highest positions of power and it reaches down into the lives of every man, woman, and child on this planet. So of course no one believes me. I'm an annoyance to my superiors, a joke to my peers. They call me Spooky, Spooky Mulder whose sister was abducted by aliens when he was just a kid and now chases after little green men with a badge and a gun shouting to the heaven and to anyone who will listen that the fix is in, that the sky is falling, and when it hits is gonna be the biggest shit storm of all time...
by Arunabh Das Two October 10, 2008
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Ateez Mingi’s iconic line that he always says (besides answer) before his rap part lol
Fix on
길을 터 이 길의 시작은 창대한 법“ -Mingi

Song: Say My Name - Ateez
by DaSpreo July 24, 2020
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fixing to- verb meaning to start or begin
I am fixing to take my shower. Anyone need in the bathroom before i do?
or
Dude, watch this, Rocky is fixing to kick Appollo Creed's ass.
or
Im fixing to go out , so don't wait up for me.
by happy 2day October 19, 2012
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verb: when someone , most likely from the south, is about to do or complete a task.
Me: When are you going to move your truck?
Truck Driver: I'm fixing to.

I am fixing to fix my stereo.
by David Koresh June 2, 2005
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Portuguese (and crossover) word for cool/having quality

pronounced feesh
Ja fostes a Lisboa? É mesmo fixe!

Have you been to Lisbon? That place is fixe.
by contagion; July 12, 2009
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Something that is or will have a certain outcome
KSI V LOGAN PAUL (25th August 2018) THE MOST FIXED EVENT IN HISTORY ALL SO THEY CAN GET MORE MONEY AS KSI GOT £80 MILLION FROM THE FIRST FIGHT
by Lord Shrigga August 26, 2018
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