Green’s Dictionary of Slang

axle n.

[play on arsehole n. (1)]

the buttocks.

[US]H. Roth Call It Sleep (1977) 312: ‘Aaa, kiss my axle,’ Polly glowered.

In phrases

drag one’s axle (v.)

(US) lit. or fig., to go slowly, to idle, to dawdle.

[US]A. Zugsmith Beat Generation 59: He was dragging his axle in waltz time.