“Hard R” certainly, regarding both tone and language.

Hard R as in rating or Hard R as in he plays a character who uses the Hard R?

It would have been as to Star Trek as Inglorious Basterds is to a historical documentary.

Balls-Out

Captain Kirk probably approves.

On the other hand, we’d see everyone’s feet

I believe the latter would beget the former and it’s Tarantino, so I’m gonna go ahead and say both.