Thirsty

Thirsty is an adjective with two common uses. The literal sense describes the state of needing or wanting to drink fluids. In physiology, thirst is a homeostatic mechanism that prompts fluid intake to maintain body water balance. In medical terminology, excessive thirst is called polydipsia, and it can be a symptom of dehydration, heat exposure, diabetes mellitus, diabetes insipidus, or certain medications. The sensation is regulated by the hypothalamus; osmoreceptors detect increased plasma osmolality or decreased blood volume, signaling the brain to induce drinking and conserve water via vasopressin (antidiuretic hormone). Visible signs include dry mouth, dry mucous membranes, and dark urine; nocturnal thirst can occur and may require medical evaluation.

Slang usage: In modern English, thirsty can describe someone who seeks attention, admiration, or validation, often in a sexualized or suggestive context. The term has given rise to phrases such as thirst trap, referring to a post intended to entice others. This usage is informal and widely used in social media discourse.

Etymology: The word is formed from thirst plus the adjectival suffix -y, deriving from Old English thurst. See also polydipsia, dehydration, diabetes insipidus, and thirst trap.