noun: a drunkard; alcoholic liquor
verb intransitive: to drink or to get drunk
From Yiddish shiker, from Hebrew shikkor, from shakar (to be drunk).
Earliest documented use: 1892.
Usage (from Wordsmith)
“Do you think I’m shicker?”
“Right now I would say yes. After four drinks, yes.”
Dan Pope; In the Cherry Tree; Picador; 2003.