This word can be used to describe a woman who is unique, mysterious, sexy and has the ability to seduce any man with her sense of humor and is able to be "one of the guys" without loosing her undeniable sexy swag. She is also very intelligent, loved by all and able to party with the best of them. Don't get a lacinda angry, you won't like her when she's angry.
Khus ka lainda is a Urdu swear word invented by Mehraz Ali Khan and popularized by Nawazish Ali Nusrat. The meaning of this word is unclear and vague but it is still a very cool thing to say.