Boyz II Men -- We've Come to the End of the Road ... For Your Movie Title

Boyz II Men are on bended knee asking a filmmaker to change the title of his new movie "Boys 2 Men" ... and if he refuses, the group says they're going to court.

Reps for Boyz fired off a letter to the movie makers this week saying they never gave permission to use the name ... so they're ready to pull out the heavy artillery against the filmmaker, as well as any theater or website that runs the flick.

The writer/director for "Boys 2 Men" tells TMZ ... they will not change the title of the movie unless they're boxed in a legal corner ... and so far they don't think they are.