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.”

Bad Shit Crazy by uncreated November 10, 2014

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bad ass shit

A word created by freaks/losers/gawks etc. It was made to be offensive but isnt and now normal people use it in a jokey way. :)

Girl - "yeahh well there my mates"
Clare (the geek) - "Well then theyr'e all bad ass shits!" in a fake american accent
..
Girl 1 - "Dude, guess wat i did last night ----"
Girl 2 - "Ooh you bad ass shit"

bad ass shit by Kim.And.Lou January 22, 2008

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