@wayne,
Lets see
"intellectual" = engaging the intellect
"property" = that which a person owns. So Intellectual property is the product of the intellect.
"Shelf life" = the length of time that food, drink, medicine, chemicals, and many other perishable items are given before they are considered unsuitable for sale, use, or consumption.
"Banana" = a genus of tropical herbaceous plants, and the fruit they bear, that does not have a very long "shelf life"
Put it all together and what do you get, any produce of the intellect is likely to have the lifespan of a mayfly.
"Mayfly" = insects which belong to the Order Ephemeroptera (from the Greek ephemeros = "short-lived", pteron = "wing", referring to the brief lifespan of adults).
I hope this helps, but don't worry, given the lack of intellectual product, none of the above is likely to apply to you.