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An alcoholic.
"Jesus, that hobo's been drinking meths for the past 6 hours."

"Aye, he's a true unquenchable."
by MrE26 July 23, 2008
BEYOND being thirsty. You cannot get enough to be quenched. You have passed the point of thirsty, parched, and dehydrated.
Rico: That girl is parched!
Marisa: No she is thirsty!
Rico: Naw girl, she is DEHYDRATED!
Marisa and Rico: SHE IS UNQUENCHABLE!!!
by mmmchk October 08, 2013