Rapper Too Short Is Not Dead

Rapper Too Short is Alive and Well

Despite Twitter Rumors Too Short Is Alive And Well

Too Short Pimpin Ain't Easy

Despite what you may be hearing on Twitter ... rapper Too Short insists ... he's NOT DEAD.

The Internet has been on fire with false reports that the rapper died from a heart attack today -- and several pranksters have already attempted to change the guy's Wiki page to reflect his death.

But T.S. just tweeted, writing, "Stop calling my phone. I'm not dead. Been in the lab working on my 19th album."

And just to make sure, TMZ spoke to the guy on the phone -- As TMZ Puts it "we're pretty sure that settles it ... the guy's alive."

Either that ... or ZOMBIE APOCALYPSE.

Too Short Is In Studio Recording New Album