To want ass/dick so bad that one would go to the extreme to get said ass/dick. Usually the non contagious disease of thirst is found in females but it can also be found in men. Thirsty men are known to masturbate A LOT. Though this disease is not contagious, do not and I say DO NOT interact with thirsty bitches/manwhores.
Ben: I would run through the Sahara Desert, get stung by 14,562 bees simutaniously, fight off Bruce Lee, Chuck Norris, and Shaq all at the same time, drive a bike with one wheel through Compton naked without any clothes nor means of protection, lick a sweaty ass donkey's pussy out, fuck a 74 year old woman who has herpes, and get my penis pierced in 17 different places just to have a 1 in 32,466,244,354,845 chance of breathing in a single air molecule that has touched your beautiful lips that I would love to lick so hard right now.

Girl: Dang bitch, thirsty…or naaaaww?
by A mothafuckkin starfish April 5, 2014
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To crave attention.
Trying to talk to the opposite sex (most likely)

Like if a girl/guy like someone they try wayyy to hard to talk to them when the person isn't giving them the time of day
damn why he so thirsty..he's always in my inbox trying to talk to me,like can't he see that I don't want him !
by nainai16 July 9, 2012
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When your visibly or verbally showing how much you want a guy or girl.
Geex,maybe he'll come over & talk to you if you stop acting so thirsty!
by collegechick18 June 25, 2010
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Someone who is thirsty for attention and will do sexual favours to get it
"Did you hear she sucked his dick?" "Yeah, she's thirsty"
by 178838285 June 16, 2013
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When a a girl wants attention from a guy, but he could care less about her.
Brad: Jessica's been following me around all night. She won't leave me alone!
Dean: She's thirsty man!
by KittyBangs July 16, 2013
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Wanting someone or something really bad
I am so thirsty for him.
He's thirsty to go clubbing tonight.
by Maya June 21, 2003
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When a person looks at another person with sexual desire. Mostly the expression is made by eye contact or sometimes by force skype sessions.
During the movie The Last Jedi there is an elevator scene were the main characters Rey & Kylo undressed each other with a thirsty stare. Also the Official Star Wars page on twitter confirmed that Kylo Ren was thirsty for Rey.
by RogueOne2019 April 4, 2018
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