Stop playing computer games, and get busy with your homework.

The couple were getting busy in the front room when the doorbell rang.

Homer and Marge have to try to explain things to children who are too worldly to fall for most excuses, the explanation trails off, and what could be a pleasant family outing to solve it all turns out to be yet another excuse for self-involvement when one public humiliation doesn’t outweigh the joys of getting busy in a windmill.

Alyx Vance: Did Dr. Kleiner just say to everyone that they should get busy?

Thurl: Are you busy?
Alexia: Really? The days pass like decades in here, Thurl. We won't be busy until that worldship decides to talk back to us.
Thurl: And yet, you have been…
Alexia: Thurl. If you say "getting busy" I will punch you so hard you'll have to spawn child processes just to feel all the pain.

Get busy

Meaning

Verb