A Blimp Berry is an item in the Wii video game Super Mario Galaxy 2. It is a blue berry that can be consumed by Yoshi to inflate him like a balloon and turn blue. Mario will hang onto the inflated Yoshi who will slowly float upwards. After a few seconds, Yoshi will turn back into his normal self.
The Blimp Berry was first shown in the E3 2009 trailer for Super Mario Galaxy 2. The form Yoshi takes when he eats a Blimp Berry is shown on the cover of the game, which was revealed during the Nintendo Media Summit in February 2010.