Bad Shit

1. Weed spiked you nasty suff like kerosene.
2. The shit that a stranger gives you saying it's weed, when infact it's ethnobotanical (legal) shit.

Really cool.

Typically Said after a night of explosions at the yard a m80 at the damn or just flying down 95 with your infinity about to explode

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.”

When something is so awesome that irony is required.

Something that is truly amazing and mind blowingly awesome.

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. :)