Mean Tweeter on Kimmel -- Thanks Obama ... You Got Me Free Beer (VIDEO)

The "Mean Tweeter" on "Jimmy Kimmel Live!" who blamed Barack Obama for the hike in beer prices just caught a break ... FREE BOOZE -- but this time, he really can THANK the Prez.

Obama took part in Kimmel's "Mean Tweets" segment Thursday night and read one from Eric Matthews, which said, "A 30 rack of coors light is $23 now at Sun Stop. Thanks, Obama."

Matthews was shocked his online quip got read aloud by the leader of the free world ... and this morning he hit up Sun Stop to celebrate. When he told the teller about Kimmel, Eric got hooked up with a free case of Keystone and a bottle of Bacardi.

Watch the video, it's pretty awesome -- Eric shotgunned one of the cans outside to celebrate ... and of course, gave thanks to Obama.

FYI -- it may be early, but Eric's not an alcoholic ... he's on his way to celebrate Spring Break.