Possible Clues:

• Racing game with Yoshi and Bowser
• Racing video game with a Rainbow Road course
• Game with a Bowser's Castle course
• Racing game with speed-boosting mushrooms
• Source of the 'Luigi Death Stare' meme
• The way you REALLY play is you can't be driving your character while you're drinking your beer BUT your beer has to be finished before you cross the finish line
• Series of Nintendo games