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Anal Cranial Inversion: One's head lodged firmly up into their rectum.
Don't ask for her advice, she's got ACI
ACI by 12kcolg November 2, 2008
Related Words
Anus Cleaning Incident

An incident during showering when one cleans his/her anus and water penetrates the asshole accidentally.
Mike: Dude, I had the worse ACI today. Almost pooped in the shower.
Rob: You should have used a low flow shower head to clean your ass.
ACI by innoslang September 3, 2014
Today i copped an aci
Aci by Churroreal November 23, 2021
ACI by anonymous February 15, 2022

Ven Aci Ahora 

This one sentence is every hispanic kids nightmare. You know you about to get the absolute shit out of you.
Mom:Juan Carlos Ven Aci Ahora
Friend: oooooooh you in trouble.
You: See you in heaven my amigo.

the aci effect 

When a youtuber joins a discord chat and everybody .fights eachother to join too
Person 1: yo, *famous youtube name* just joined the chat
Person 2: Oh No! The Aci effect will happen!
*Lots of cringy peeps trying to join the chat*
the aci effect by minedor May 24, 2017