fent rock

a fent rock (v.) is an involuntary reaction when a fentanyl user is standing but slowly begins to fold and go in circles or back-and-forth motion, also very slowly. This is usually due to the drug peaking or when the user has consumed too much, but not enough to overdose.

"do you see that person over there doing the fent rock?"
"you ever get so blazed (off weed) you start fent rocking?"
"have you seen the raccoon in Baltimore doing the fent rock?"