Green’s Dictionary of Slang

thick and thin n.

[rhy. sl.]

1. the chin.

[US]A.J. Pollock Und. Speaks.
[US]Monteleone Criminal Sl. (rev. edn).
[US]Berrey & Van den Bark Amer. Thes. Sl. (2nd edn).
[SA]L.F. Freed Crime in S. Afr. 106: His ‘thick and thin’ [is] his chin.
[UK]B. Kirkpatrick Wicked Cockney Rhy. Sl.

2. gin.

[US]M.C. Sharpe Chicago May: Her Story in Hamilton (1952) 132: Thick and thin – gin.
[Aus]Argus (Melbourne) 13 June 4s/2: If, however, he consumes too much ‘pig’s ear ’ or ‘thick and thin’, he may finish up mollies [...] contracted from ‘mollie the monk’.
[Aus] ‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xli 4/3: thick and thin: [...] gin.
[UK]B. Kirkpatrick Wicked Cockney Rhy. Sl.

3. (Aus.) the skin.

[Aus]Pete’s Aussie Sl. Home Page 🌐 thick and thin: the skin.