go it

go it  {v. phr.},  {informal}

1. To go fast; run hard; not to spare yourself. — Often used as a command.

The coach yelled to the runner to go it.

At the party the girls cheered for their partners to go it.

The boys called, "Go it!" to the dog chasing the cat.

2. To live; continue to do or work.

John wants to leave home and go it alone.

Compare: ON ONE'S OWN.