Used to define extreme mental maladies.

More emphatic version of batshit crazy
Hey, Britney Spears has gone batshit crazy.

No, she's more like Pterodactyl shit crazy.
by Cazboab December 12, 2010
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#ap shit crazy is when your diamond Audemar Piguet watch is losing its mind
"BrO mY wAtCh Is BrOkEn #ap shit crazy"
by jaydaddyjay April 18, 2018
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In reference to doing bad drugs (bad shit) which make a person mentally unstable (crazy.) As opposed to good drugs (good shit.)

Regarding “batshit crazy”
The “t” sound, is a blurring together of words, often more pronounced (obvious) in poorer areas, where people do not annunciate every syllable.
Common sense indicates the drug subculture, who is partly behind the propagation of the expression, came up with it to describe:
“You did bad shit, made you crazy, calm the hell down”

As “bats in the belfry” is a literary expression, and not a live common phrase (go down to the local ghetto and ask who knows what a belfry is, then ask if they know what “bad shit” is).

Contextually most people understand that, to take “bad shit” can make somebody crazy, therefore the obvious result “bad shit crazy.”
“Did that bitch smoke some bad shit? He actin all bad shit crazy.”
by uncreated November 10, 2014
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-When a loved one, friend or co-worker is excessively eating large portions of food in a short amount of time.
Karen- *eating doughnut after doughnut*

Steve- "whoa karen, you're going fat shit crazy on those doughnuts, you think you could slow down? save me a jelly filled while your at it."

Karen- "Sorry I've been a real chunker lately"
by WHOISTHISDUDE July 31, 2011
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drunk, crazy, destructive, and bad, from NickelBack's "Burn it to the Ground"
I've got a fist full of whiskey, the bottle just bit me
Oh, that shit makes me bat shit crazy
by abra cadabrazz August 17, 2009
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