Rosario Dawson Causes Star Trek Nerdgasm ... With Her Tongue

3/21/2014 3:00 PM PDT BY TMZ STAFF

Rosario Dawson must be tired ... 'cause she's running around the heads of millions of Trekkies now -- after showing off her Klingon language skills.

Yes, it's an actual thing ... and yes, we're about to tell a story in the native tongue of those beautiful bastards (subtitles included).