an umbrella-term that scumbags, swindlers, bandits, psychopaths are using to call attacks on them and normalize the abuse of whoever they've chosen to abuse and scare the normies away; if they were to call it revenge-attacks or sabotage - then it creates implication of a reason and therefore more people looking into it and finding the reason and therefore exposing the above peoples and normie ignorance (hence normies are kinda ok with it).

'Terrorizing' something or somebody, which is abuse and fear-inducing threats (and possibly murder) that mostly organized people in position of power, business or in a criminal group use against exploited and abused by them people, or what organized radical political movements use against other political movements.
Sometimes used ironically (regardless of reasoning/just an expression of being annoyed), when someone keeps demanding from or bothering someone.

Murder attempts against the establishment and some sort of guerrilla warfare during 'officially' peace time are typically called terror attacks.

Basically a bias-based term: "whatever we're doing is just, whatever others against us - terrorism".