"Rehna" means "to stay" or "to remain".
"Bindas" is an adjective meaning "carefree", "unconcerned", or "relaxed".
The phrase is often used to encourage someone to relax and not worry about things, especially in a casual or friendly setting.
Examples:
* "Rehna bindas, sab thik ho jaayega" (Stay carefree, everything will be alright)
* "Zindagi mein rehna bindas, tension kisko" (Live life carefree, why worry?)
* "Aaj to bas rehna bindas aur maza karna" (Today, just be carefree and enjoy)