Possible Interpretations:
* Sound: It could be a word describing a sound, perhaps a soft, squishy, or plopping sound.
* Shape: It might describe something with a soft, rounded shape, like a blob.
* Feeling: It could relate to a feeling, perhaps something silly, playful, or amusing.
To understand its meaning, you need more context. For example:
* Who used the word? A child, an adult, someone from a specific region?
* In what situation was it used? What were they talking about or describing?
Without more information, it's impossible to know exactly what "ploopy" means. If you provide more details, I might be able to help you decipher its meaning.