Matthew Perry's 'Mattman' Posts Before Death Weren't A Cry For Help, Friend Says

There's a wild conspiracy theory floating around that Matthew Perry's recent "Mattman" posts before his death were a cry for help ... but the woman he dined with the day before he passed says that theory couldn't be further from the truth.

Athenna Crosby, the mystery brunette spotted grabbing a meal with Matthew before he died, tells TMZ ... the "Friends" star was really into Batman -- even calling himself "Mattman" and his ride the Batmobile.

She says he was a playful guy in the months that she knew him ... and the conspiracy theory he was pushing subliminal messages about his safety by using the superhero reference is way off.

Athenna playfully chalks the "Mattman" posts up to Perry being a nerd and says fans jumping on the conspiracy train are definitely getting carried away.

As we reported, the 25-year-old model and entertainment reporter grabbed a bite to eat with Matthew last Friday at the Hotel Bel-Air ... and said she was devastated to learn of his death just a day after seeing him.

Athenna doubles down on what we've been told already -- the actor was extremely optimistic and in great spirits leading up to his death ... and he even had projects lined up.

In fact, Athenna tells us there's been a lot of speculation surrounding Matthew's death in the days since he passed away ... and while she can only speak from her experience, she's certain his untimely death was a tragic accident.