A reference to rapper Fivio Foreign’s verse in song “Zoo York” by Lil Tjay (feat. Pop Smoke & Fivio Foreign). In his feature, Fivio Foreign raps, “I know they an opp ‘cause my finger keep twitchin’” (Fivio Foreign). Therefore as aforementioned, someone’s finger twitching means you are an opp.
An example of this phrase in a sentence is:
Friend 1: Splashes dirt on Friend 2 shoes.
Friend 2: “My finger twitching”
Friend 1: (Cries knowing they are an opp)