Green’s Dictionary of Slang

(US) an appetite, esp. one developed after smoking marijuana.

1970		Playboy Dec. 122: The stoned hungries are merciless [HDAS].
1976		C. Durden No Bugles, No Drums 11: The screaming hungries hit us about an hour after we’d smoked.
1987		S. King Misery (1988) 41: I Got the Hungries.
2002		Camping.about.com 🌐 Very good and it keeps the hungries away while fixing the rest of the foods. (This recipe can be prepared ahead of time at home to take to the campground.).