To smell ill; to become moldy.
This lovely verb comes from the world of winery. In Old French, fuste referred to the taste of whine which was left to age for too long, eventually smelling and tasting like the cask it was left in. Earlier, the Latin word fustis referred to the wood planks casks are made of. The stale smell sense when referring to people is dated back to the late 14th century.
Why this word?
I’ll be honest with you; there are very few unused verbs, I’ll post of each and every one.
Asides, it is a nice verb to use when regarding to our less-rose-like-smelling friends, or even food that was left outside the fridge for very long. We know fusty as an adjective, now we can also verb it.
The Urban Dictionary did not leave this one out, and here is what it reads: “to fust is to lay around one’s apartment or house with their best friends in their skivvies and mess around. Actions may include making retarded noises like eeerriiiiiieeee or ugugueuguegu, squeezing eachother’s teets, or poking at eachother with toesies that are in dire need of a pedicure. Fusting typically goes hand in hand with shoving food as well. Let’s rent a movie, order a pizza, stay in tonight and fust”.
How to use fust?
When your friend spends too long at home, crying and feeling sorry for him/herself, clearly eating too much and not paying attention to personal hygiene, you can say “You did enough of fusting! Let’s get you into the shower”, or “You have fusting vegetables in the fridge, you should really clean it…”