Green’s Dictionary of Slang

jabber-juice n.

[SE jabber, to talk unrestrainedly + juice n.1 (3e)]

(US prison) sodium-pentothal.

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[US]F. Hilaire Thanatos 94: You’ll be [...] fixed with truth drug. And, unless you’re a pretty weird character, you’ll blab. But, in this case, you’ll only get enough jabber-juice to get you high. I’ve tapped about two-thirds of the ampule and filled it with salt water.