From the Super Mario Wiki
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The Giga-carrot is a carrot grown by the Wigglers of the Wiggler Family Farm in Dimble Wood. In Mario & Luigi: Bowser's Inside Story, Bowser discovers the carrot when looking for a Banzai Bill. He pulled it out, with help from Mario and Luigi in the Arm Center. When a Wiggler sees this, it says Bowser has to eat the carrot. This must be digested by Mario and Luigi in the Gut Check. After eating it, Bowser asks for the Banzai Bill, but Wiggler forgot it and is so angry at Bowser, because he ate the carrot, that he will battle Bowser. If Bowser fails to eat it the first time, it will be replaced with a bunch of smaller carrots.