Green’s Dictionary of Slang

key v.

(orig. US campus) to scratch an automobile with a key or other pointed object.

[US] P. Munro Sl. U.
[US]Tarantino & Avery Pulp Fiction [film script] 33: You know what some fucker did to it [i.e. a car] the other day? [...] Fuckin’ keyed it.
[Ire]P. Howard Curious Incident of the Dog in the Nightdress 36: If that jammer [...] hasn’t been keyed by the time I come back, there’s ten sheets in it for you.
[Scot](con. 1980s) I. Welsh Skagboys 335: Ah start tae idly key a smart estate motor.
[UK]R. Milward Kimberly’s Capital Punishment (2023) 12: I’ve often wondered why people like to [...] badmouth you, or key your car.
[US]T. Robinson Rough Trade [ebook] ‘He keyed Dana’s car, he smashed our window’.

In derivatives

keyed up (adj.)

(Aus. drugs) under the influence of cocaine, thus aggressive.

[Aus]Sun. Mail (Brisbane) 13 Nov. 20/7: ‘Joe was buckled last night. He was all keyed up with angie and tried to take a twist out of a demon, he dug his heels in and it took three of them to lumber him.’ [...] Joe was under the influence of cocaine. He used insulting language to a detective, and resisted so violently when placed under arrest that it took the detective and two other officers to remove him to the watch house.