tweaking
irrational or adjusting
the one-line answer
Acting strangely or irrationally. Or making a small adjustment.
Tweaking has two meanings. In the drug sense it means someone is behaving erratically from stimulant effects. More generally it means acting strangely or irrationally. Also used literally for small adjustments.
mainstream
Your coworker might use this word.
01 / in the wild
hear it move.
roast
bro is tweaking. that decision made no sense.
He is acting irrationally. That decision was bizarre.