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To shutdown a machine, typically a computer. Opposite to reboost
I am going to have to deboost this computer because it has completely locked up!
deboost by Clifford H. Boost November 27, 2006
Related Words
When a movie undoes another. retcon
From the Simpsons:

Homer: Wait, you guys saw the new Radioactive man sequel?
Carl: Uh, it's not sequel,it's a reboot.
Lenny: Actually, this one undoes the stuff from the last one, so it's a deboot.
deboot by T1T5McGraw February 4, 2015

The Debooserie 

The act of trying to jam one's own penis into their asshole while eating tapioca pudding and humming the belgian national anthem
The only way i could get up in your mom's slacks was to do the Debooserie
deboosh replaces any noun in a sentence...so it means all
Damn that girl has a lot of deboosh; it makes me hard in pants.

That damn man debooshed all over my carpet.
deboosh by donald April 5, 2005
The process of using friends and family for the removal of a brand new snakeskin cowboy boot.
Cowboy 1: Todays honky-tonkyn rally really rocked! Do you want another Bushwacker before hitting the hay?
Cowboy 2: I can see no reason why I wouldn't. But meet me outside the barn first. I need help debooting.
Cowboy 1: Hell yeah! To deboot is one of the most intimate things a cowboy can do to another fellow rider.
deboot by swaglord_mcmuffin December 6, 2021

debooting 

Waiting for your (compute)r to shut down.
We could not leave (work) until our computers were done debooting.
debooting by Momma 24 March 11, 2010