Green’s Dictionary of Slang

groatable adj.

(US) drunk.

1737		B. Franklin ‘Drinkers Dictionary’ in Pennsylvania Gazette 6 Jan. in AS XII:2 91: They come to be well understood to signify plainly that A MAN IS DRUNK. [...] Groatable.
a.1856		B. Franklin q. in Hall (1856) 461: Dr. Franklin, in speaking of the intemperate drinker, says, he will never, or seldom, allow that he is drunk; he may be [...] ‘groatable, confoundedly cut, [...] pretty well entered, &c., but never drunk’.