Green’s Dictionary of Slang

crock n.3

[fig. and lit. uses of SE crock, a pot]

1. (US) the head; esp. in phr. off one’s crock, out of one’s mind, crazy.

[US]A.J. Barr Let Tomorrow Come 27: Listen, Joe, you’re off your crock on that.

2. (US drugs) an opium pipe.

[US]D. Maurer ‘Lang. of the Und. Narcotic Addict’ Pt 2 in Lang. Und. (1981) 101/1: crock. 1. An opium pipe. 2. The bowl of an opium pipe.
[US]Monteleone Criminal Sl. (rev. edn).
[US]J.E. Schmidt Narcotics Lingo and Lore.

3. (US) a bottle of (illicitly distilled) whisky.

[US]A.J. Pollock Und. Speaks 27/1: Crock, a bottle of bootleg whiskey.
[US]R. Leveridge Walk on the Water 15: One crock between twelve guys? [...] there’d be nothing left for us.
[US]Wentworth & Flexner DAS.

4. a drunkard.

[US]M. Prenner ‘Drunk in Sl.’ in AS XVI:1 Jan. 70/2: drunken person [...] crock.
[US]New Yorker 2 Sept. 66: The Bevins lose their boozy Uncle Joe [...] it is discovered that the aged crock […] [W&F].

SE in slang uses

In phrases

give the crock (v.) [SE crock, a jug, i.e. to award a fig. cup as in a sporting victory]

to admit defeat, to award a victory to someone else.

Our Boys No. 2 Dec. in Ware (1909) 142/1: I have been making a long calculation, and I find that this sum will only just cover ex.’s, so I am simply giving you the crock.