Charlie Sheen to Packers Guy -- WE WON ... LET'S KISS!

Charlie Sheen was so pumped about the Green Bay Packers beating the Dallas Cowboys on Sunday -- he raged with fans at a local bar after the game ... and kissed a dude on the mouth to celebrate.

We're told Sheen -- who flew in especially for the playoff game -- hit up a place called Symba's Pub and Grub in Green Bay and bought shots and drinks for a bunch of Cheeseheads who were still fired up about the victory.

Then, at the end of the night, things got kissy in the bar -- and a male Packers fan decided to seal the victory with a liplock from Sheen.