Viral Sorority Chick -- 'C*** Punt' Returns ... My F-Bombs Are Getting Published

The sorority chick who went viral for threatening to "c*** punt" her sisters is now being paid to write obscenities in a book ... and if you thought she'd tone things down -- YOU WERE WRONG!

TMZ has learned Rebecca Martinson -- who famously blasted her Delta Gamma sisters in a 2013 email that leaked online -- consulted on an upcoming book by Taylor Bell titled "Dirty Rush" ... and the foreword she wrote is filled with f-bombs.

A few select excerpts:

- "This book tells it like it f****** is. You won't find anything in here about how all sorority girls are vacuously stupid."

- "And you sure as f*** won't read anything about how a sorority girls' sole purpose in life is to be perpetually drunk and do the spread eagle wasted for frat bros."

She also helped the author make the dialogue authentic ... peppering in a few real life experiences of her own -- like the time she had sex wearing a tampon.