Green’s Dictionary of Slang

to hurry away.

1865		Leaves from Diary of Celebrated Burglar 44/2: She was getting tired of him living upon her and using her money as if it was his own, so she was glad to let him ‘slither’.
1885		Bulletin (Sydney) 29 Aug. 22/2: [A] boy at the window, over from the fruit shop, with a memo. demanding ‘immejat payment, as you’s going to do a slither.’.
1885		Bulletin (Sydney) 19 Sept. 14/2: Then disgusted, at length, cried Joanna: / ‘I will slither straight back to Aunt Hannah;’ / So she flies, in a funk, / With a half-corded trunk, / Leaving ‘fairwel’ scratched on the pi-anner.
1900–10		Stephens & O’Brien Materials for a Dict. of Aus. Sl. [unpub. ms.] 143: SLITHER: to clear out or escape.
1901		W.S. Walker In the Blood 244: They might ’a’ slithered with your goods if you ’adn’t been so mighty sharp with your hands [F&H].
1941		Baker Popular Dict. Aus. Sl.
1955		N. Pulliam I Travelled a Lonely Land (1957) 239/1: slither (sling) – get going.