The proverbial "brain fart". Also known as "scf". Making a silly mistake. A small, yet ridiculous blunder.
"I was suffering from some sort of "sub-cranial-flatulance" that day, my bad."

"You should take sumthin' fer that "SCF" of yours... "
by Fish October 15, 2004
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John: Yo I'm gonna go pwn some n00bs lol lol rofl !!!11!!oneoneone!!111!
Luke: Yo you are suffering from a serious Cranial Rectal Inversion
by EllieJewFace September 4, 2007
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The Neo-Con malady of having your head encased firmly in your rectum, thereby preventing you from seeing reality and having to base yourself only on what your leaders say.
Anyone who believes that Iraq had WMD's suffers from a terminal case of Recto-cranial Immersion.
by Kay_ieee June 4, 2005
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A chronic condition by which the physical connections between the buttocks and head are reversed, causing fecal material to spew from the mouth. Conventional treatments include wiring the jaws shut or the prompt use of a gag ball.

ACIS is more harmful to those coming in contact with the ACIS person than the ACIS person him/herself. Even casual contact results in looks of disbelief, screaming and the uncontrolable urge to place one's hands over one's ears and yell "Make it stop". Family and friends living with an ACIS patient are advised to wear ear plugs, or in more extreme cases, to drive shiskabob spears through their ears.

Not to be confused with having Head-Up-Assitisis or Asshatoses.
President Bush displayed symptoms of Anal-Cranial Inversion Syndrome at his last interview when he spoke about his legacy.
by radfringe December 14, 2008
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The Liberal malady of having your head encased firmly in your (or someone else's) rectum.
Al Franken suffers from a terminal case of Recto-cranial Immersion.
by Proud Conservative September 22, 2003
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To be given the sole responsibility of an important task or mission. Usually, this applies to situations where an experienced master of their craft passes on the mantle to a rookie with little to no prior experience. This rookie is often attributed to be "built different".
Doctors rushed to get this very important patient to the operating table as quickly as possible. The top neurosurgeon at NYU Langone informed the others that the graduate student will be joining them. The others who collectively represented 200 years of experience, panicked as they argued that this wasn’t a place and time for a rookie to shadow them. “Oh, he won’t be shadowing us”, as the student was being handed the cranial drill.
by Hotwhip8 September 8, 2020
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