The man in the 8-ball jacket ​seen slapping a belligerent woman on the F train ​in an online video that went viral ​had all charges against him dropped Monday afternoon after authorities ​determined he was acting in self-defense, his lawyer told The Post.

Jorge Pena spent four nights in jail after the brawl, which ​was widely viewed after footage was posted ​to YouTube, before making his $1,000 bail early Tuesday.

A law enforcement source confirmed that all the charges against Pena were dismissed.