STL Cardinals Outfielder Can Save Your Beer With Brilliant Invention!

You know what sucks ... LUKEWARM BEER!!!

But fear not, St. Louis Cardinals outfielder Stephen Piscotty says he can save your mouth from sucking down overheated brew ... with a very chill invention.

It's called the Beer Bit -- and Stephen and his brother, Nick, swear it will keep your booze COLD for up to an hour!!!

The guys just launched their own Kickstarter campaign -- and already raised more than $13,000 ... PLUS they even got teammate Yadier Molina to help promote it!!!