Okay kiddo, so you know how we use big words sometimes to make things shorter or easier to say? Like instead of "refrigerator" we say "fridge"? Well, a "numeronym" is kind of like that, but with numbers.
You see, in a numeronym, we take a word and replace some of the letters with a number. For example, instead of writing "please" we might write "pl3ase". The numbers take the place of letters and make the word shorter to write or type.
Now, numeronyms are not always easy to read or understand, especially if you don't know what they mean. And sometimes they might be confusing or hard to remember. But people use them sometimes because they think they're cool or because they want to save time and space when they're writing or typing.
So that's what a numeronym is - a fancy way to say a word using numbers to shorten it. Pretty neat, isn't it?