Green’s Dictionary of Slang

1. (S.Afr./US) to run off.

1919		A. Baer Two and Three 24 Jan. [synd. col.] Lamping one of those one-flight-up suits is enough to make a vet [...] loop it for the nearest exit.
1947		T. Thursday ‘Sing Sing Sweeney’ in Crack Detective Jan. 🌐 When the [Chicago] Loop became too loopy, he looped to Broadway, New York.
1963		L.F. Freed Crime in S. Afr. 106: When he says he is ‘looping’ away from a ‘bottle and stopper’ or from a ‘copper’ he means he is running away from a policeman.
1969		A. Fugard Boesman and Lena Act I: Then they found our place there in the bush. Loop, Hotnot! So Hotnot loops . . . to Swartkops.

2. to be a caddie; thus n. a round of golf.

1981		J. Ellroy Brown’s Requiem 23: I was loopin’ Hillcrest [...] That’s right down the street where all the Hebes play golf.
1981		J. Elllroy Brown’s Requiem 63: The caddy master is a bookie, and the guys who bet with him get primo loops.