Hindi. Used in India/ Pakistan/ Indian occupied regions of the UK, Canada. Literal meaning is a respectful term for sister. Also used in a derogatory manner to denote unfashionable, uncool, housewifey sort. Usually dressed in a Punjabi 'suit' (a salwar kameez) speaking almost always in Punjabi or Hindi. Example: Rani Mukherjee, Juhi Chawla, Bhagyashree
Variation: BTM or Behenji Turned Mod. A Behenji who is trying to look hip in a clumsy, obvious manner.
Usage: a) Don't be such a behenji b) What's with all the gold bangles? You look like a behenji.