Here are a few examples of how you could use it in a sentence, although they might sound a bit unusual:
* The pinguid layer of blubber helped the whale stay warm in the icy water.
* The pinguid residue on the frying pan was a testament to the delicious meal we'd enjoyed.
* In the 17th century, some considered a pinguid appearance to be a sign of wealth and prosperity.
While you could technically use "pinguid" in these sentences, it's more likely you'd use synonyms like "fatty", "greasy", or "oily" instead.