adj

• (euphemistic) Craving alcohol; especially, experiencing some alcohol withdrawal.
  "After all that work on a stupidly maintained spreadsheet, I am really thirsty."
• (informal, uncommon) Causing thirst; giving one a need to drink.
  "Marching is thirsty work."
• (figurative) Craving something immaterial.
  "thirsty for knowledge"
• (figurative) Craving something immaterial.
  "This is the third time that girl brought up her crush. She must really be thirsty for him."

noun

• (usually in the plural) One who is thirsty (for a drink, sex, alcohol, etc.).
  "The most interesting thing to the "chicken fanciers"—and the thirsty also—was an ice cream parlor in Morrison. Before we left […] the town ran short on all brands of beer (near, Root, etc.), and the thirsties of the crowd were reduced to the tamer pastime of eating oranges and cracking peanuts."