A "Super" is the homozygous version of a co-dominant (or incomplete dominant) morph. It means that the animal is carrying two copies of the same gene, one from each of its parents. This guarantees that it will pass one of those genes along to each of its offspring. This is helpful in breeding, as it places the odds strictly in your favor when it comes to hatchlings. Also, many times the super form is visually different (sometimes drastically so) than the regular form of the morph - a nice perk indeed.
In the case of your Super Banana example, each of its parents were carrying the Banana gene, which they both passed along to the Super Banana. This Super Banana will in turn pass a single copy of the Banana gene along to each of its offspring.
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