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(1) To mould/become mouldy or to waste away

(2) Just a generally awesome word, to use in generally awesome sentence or just as an outburst because of it's awesomeness.
(1) "Go and fust in the corner"

(2) "Fust. How awesome"
Fust by I Sit Next To You In English December 28, 2010
Related Words
~Fucking stupid.
~When you want to say someone or something is fucking stupid without saying, "fucking stupid".
"That's fust!"
"I'm not doing that because it's fust!"
Fust by Cosado11 January 28, 2019
To fist fuck. Penetration of a vagina or anus with a fist.
I'm gonna fust the shit outta that skank tonight, her pussy is so loose its like fucking soup.
fust by BiG nELLs. January 25, 2005
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, and stay in tonight and fust.
fust by fusty mcgee June 21, 2006
When you fuck a girl and fist her at the same time, stretching her cunt to be 20 times the size.
Jose: Maria, what's your opinion on fusting?

Maria: Oh, its quite enjoyable.
Fust by GerryThornberg January 10, 2009
a word created by someone on nitrous oxide one day trying to say shut the fuck up like yoda so she said fust as in fuck up shut the
he was being annoying so i told him to fust