Wiktionary
a. (context idiomatic informal English) exaggerated, bizarre or unpredictable.
Usage examples of "on acid".
Bevis created a bacterium that lived on acid precipitation and neutralized it.
The index finger of her right hand moved across my palm like a doodlebug on acid.
We could always load up on acid and spend the day roaming around the clubhouse grounds with big sketch pads, laughing hysterically at the natives and swilling mint juleps so the cops wouldn't think we're abnormal.
I hadnt counted on this: Finding my attorney whacked on acid and locked into some kind of preternatural courtship.
Most of the time she was high on acid while she was with the Front, and she was always the type who needed to belong to some kind of group, whether it was a commune or a band of militant terrorists.
He had seen Julie so strung out on acid that she thought the flesh was melting from her bones, and her parents couldn't even deal with her drinking beer.
What happens usually is that a couple hires a hippie baby-sitter who proceeds to get stoned on acid, marijuana, or sometimes even scotch.