You use the term "fungy" when you feel fungy. I fungy, you fungy, we all fungy! Sometimes fungy is used as an adjective, describing a circumstance that is extremely good for some, and extremely bad for others.
When something is 'fungible' as opposed to 'non-fungible'. Meaning it exists in the physical space.
You can buy an NFT of a Ferrari for $150,000, and if you choose to, you can burn the NFT and receive the car. This transitions from a non-fungible asset into a fungible one.
"My Ferrari's is now fungy yo!"
According to Vivian (YouTube Channel Vivian Tries) Fungalitus is present on items that you think are clean but you're not sure.
I just got these new metal straws at the Dollar Store. They are probably okay to use but I think I'll put them through the dishwasher just in case they have Fungalitus inside that I can't see.