Something ginormous is really huge. Elephants are ginormous, and so is the planet Jupiter. Always put the lid on the blender when in use, or you’ll end up with a ginormous mess!
English contains a lot of portmanteau words — words made by blending together two other words or their parts. Ginormous, if you haven’t already guessed, was made by joining the beginning of gigantic to the end of enormous, combining two synonyms to emphasize how huge something is. Know which other words are made by blending? Cosplay, sitcom, and infomercial are a few. You can probably think of others!