ipsydinxy, n. — Green’s Dictionary of Slang

ipsydinxy n.

also ipse dixit

[? echoic of the slurred tones of a drinker; ? positive challenge to a drunkard to say the Lat. phr. ipse dixit]

whisky.

a.1790		C. Dibdin ‘The Virtue of Drunkeness’ in Collection of Songs II 70: If strong ipse dixit true wisdom implies, / The man that is drunk is like Solomon wise.
1849		J.J. Hooper ‘The Muscadine Story’ in Chittick Ring-Tailed Roarers (1941) 250: Thar’s a few drinks of the ipsydinxy left.