The adjective 'batshit' (almost invariably premodifying the noun 'crazy') derives from the fact that the guano of certain bat species, when smoked, vaporises as a potently psychotropic narcotic. The word entered the popular consciousness after one of several dozen guano collectors dropped his torch, igniting the batshit (which, as a fertiliser, is flammable) swathing every surrounding surface. The fire spread rapidly, but all the workers managed to flee in time - having, however, inhaled a considerable quantity of the smoke. The resulting deranged rampage made the international news, and "bat-shit crazy" was used in the New York Times headline. This coinage by the relevant subeditor seeded the general currency of the term, consolidated by a brief outbreak of the use of guano as a recreational drug, before even the most hardcore druggies concluded that it was just too batshit crazy.
New York Times: "ORGIASTIC FRENZY AS GUANO WILD-FIRE DRIVES WORKERS BATSHIT CRAZY"
by maxcct April 8, 2011
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Batshit Insane is a level of crazy that many people, including myself, experience, either constantly or momentarily.

In order to be truly Batshit Insane, you must abandon all rational thought, and let your Bizzaro instincts take over. You must clear your mind of all those pesky morals, too. Trust me, it's very, very rewarding.

Now that's the monetary tyep, the permenant type is best explained through example:
GOOD Batshit Insane:
-Me
-You
-The existence of UltraNeko
BAD Batshit Insane:
-Transformers Fans
-Star Trek fans
-Serial killers
-Serial rapists
-Serial robbers
-Serial killer-robber-rapists
-Those who doubt UltraNeko
-Alan Moore
Good:

-So, you're telling me that there's someone in this world who is a woman, loves video games, is funny, and seems like you could talk to her on multiple levels?
-Yep.
-That's Batshit Insane!

Bad:
Random British person: Did you hear they're making a Watchmen movie?
Alan Moore: WHAT?!?!? I OUGHTTA FUCK THOSE FUCKERS RIGHT UP THIER FUCKHOELS TILL THEY CUM BLOOD AND THEN EAT THIER INTESTINES!!!!!
Random British Person: Now THAT GUY is Batshit Insane.
by ZimMan2 January 7, 2010
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When a batshit crazy woman sexually assaults a teenage boy in an attempt to impregnate herself and creates more hellspawn. This process is then repeated for several generations in an attempt to create the Anti-Christ.
Man1: Hey where were you last night

Man2: I had to fight of one of women batshit breeding
by JsLovehandles August 28, 2014
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The phrase came from Indian tribes who slept in caves. After long periods of exposure to the caves filled with "batshit"the Indians would start losing their minds. Some hyroglyphics illustrate people eating other humans including the face.
by Bat knowledge September 27, 2016
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Any buseyism is a symptom of being batshit insane
by Washashaaaaaaa January 19, 2011
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A form of narcissism whereas the person not only has an inflated sense of self-importance, but also have lost all connection to reality and facts. A batshit narcissist will conflate their negative or losing position with victory and supreme dominance, while simultaneously blaming anyone with facts or truth of deception and lies. See also Donald J. Trump
After the losing 2020 Presidential election, Donald Trump melted down and became the epitome of a batshit narcissist.
by Creative12 December 12, 2020
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