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1.
Any statement or picture used to intentionally create attention or "thirst"
Woman on Twitter: Who wants to come over and put me to sleep? (Thirst Trap)

Men on Twitter: Oh? Check Ur DMs
by Mister GQ October 11, 2011
 
2.
When a female posts a photo or status of herself being cute or sad or in whatever mood she is, and she either dresses normal or shows more skin than normal in the photo, with the direct or indirect intent of having men post compliments to her in either soft, nice or vulgar terms.

Like on Instagram when a female does post a photo and some males are being disrespectful in their advances, some males call it thirst trap as soon as the female calls them out for being disrespectful.
Girl: posts a photo of herself in a bikini
Guy #1: "that ass needs some dick"
Girl: "ugh, creep, thirsty pig!!!!"
Guy #1: "Hoe, you know that's what you wanted to hear."
Girl: "Learn how to respect a woman!"
Guy #1: "What the fuck?"
Guy #2: "Thirst traps man, thirst traps."
by The Sailing Pen August 11, 2013