Top definition
Anal Cranial Inversion: One's head lodged firmly up into their rectum.
Don't ask for her advice, she's got ACI
by 12kcolg September 18, 2008
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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.
by innoslang September 03, 2014
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