on one
erratic
the one-line answer
Acting strangely, being on something, off in behavior.
On one means someone is acting unusually or erratically. As if they are under some influence that is causing strange behavior.
mainstream
Your coworker might use this word.
01 / in the wild
hear it move.
description
she was really on one last night.
She was acting unusually and erratically last night.