jack into

(music recording, computing, electronics) To insert an electronic coupling into a receptacle; to connect to something, whether involving a physical medium or not.

(science fiction, ambitransitive) To connect a brain directly to a computer.

(transitive, idiomatic, British) To stop doing a regular activity, such as a job or studying.

(intransitive, slang, vulgar, derogatory) To masturbate.