Behen chod

It's a abusive language used by Indians or the people who know Hindi. This word means that someone fucked your sister without marriage or relationship.
P.s.- It also used to get relieve from or anger inside you, but teenagers take it as a fun and joke about their family.

Teri bhen chod dunga , akshay bhosdike
Teri aukaat kya hai, behen chod jhant barabar bhi na hai!!