Green’s Dictionary of Slang

1. to run away.

1890–1904		Farmer & Henley Sl. and Its Analogues.
1907		News & Courier (Charleston, SC) 14 Apr. 18/2: He slanted out of the door on the double.

2. to exaggerate.

1890–1904

Farmer & Henley Sl. and Its Analogues.

3. to glance at.

1911		T.A. Dorgan in Zwilling TAD Lex. (1993) 25: Don’t break your neck — just wait a minute and then slant over at that rather stout chicken — she’s a champ sure.
1920		T. Thursday ‘Fall of the Wise’ in Top-Notch 1 Apr. 🌐 I whirled around and slanted a guy with a face solemn enough to make Dante look like a humorist.
1930		J. Lait Put on the Spot 24: She kep’ slantin’ me, too, all the time.