lean and linger, n. — Green’s Dictionary of Slang

lean and linger n.

also long(er) and linger

[rhy. sl.]

a finger.

1928		M.C. Sharpe Chicago May: Her Story in Hamilton (1952) 132: Long and lingers – fingers.
1931		D. Runyon ‘Romance in the Roaring Forties’ in Runyon on Broadway (1954) 34: Well, I do not see any Simple Simon on your lean and linger.
1949		Monteleone Criminal Sl. (rev. edn).
1953		Berrey & Van den Bark Amer. Thes. Sl. (2nd edn).
1960, 1975		Wentworth & Flexner DAS.
1992		R. Puxley Cockney Rabbit.