Basically it means Casanova or Womaniser but in Hindi it does not goes too hard it is used among friends to tease, and it shows a bit of jealousy from those who don't get girls that often.
dekh bhai-laundiya ko sare din ladkiyo ke ghusa rehta hai.
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.