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The gas bacteria in the large intestine produce when feeding on your feces. It's what gives crap and farts their smell. The release of flatus is called flatulence.
John farted some stanky flatus after eating at Taco Bell.
flatus by WindWaker68 April 6, 2004
Not to be confused with the term "flatus", meaning fart gases, this word with the same spelling is pronounced "FLAW-TOOSE". Multiple meanings, but basically the Alaskan equivalent of the Hawaiian "Aloha".

Can be used to mean tired, drunk, bad or unfortunate. Also can be used as a greeting to say hello or goodbye. See examples below.
How was the football game? Man, it was flatus!
Flatus by Megaflatus November 22, 2010
Flat Us is where your home away from home is.
It makes moving to new cities seamless and makes flats feel like home.
Student 1 : I have to move to Mumbai, I have no clue how to find accommodation.
Student 2: I have a solution for you.
FlatUs!
You can find everything you want!
From accomodation to food and even travel help.
FlatUs by Flatsusss November 25, 2021

flatus superiorus 

The pseudo Latin but funny sounding term for high volume, unusually putrid and powerful farting.
Her often shocking farts ranked way up there, they were definitely considered flatus superiorus!

flatus interruptus 

A method of stopping or interrupting one’s fart, mid-fart, for whatever reason.
I had been passing what may have been the world’s most noxious and protracted fart when my grandma walked in, so I employed flatus interruptus in an attempt to spare her!

Flatus Vaginalis 

The technical name in Latin for a 'Fanny Fart', 'Vart' or 'Queef'.
"I was engaging in copulation the night previously, when my dearest partner of my non-marital relationship released an expulsion of air, a Flatus Vaginalis my dear boy, from her Vulva."
Flatus Vaginalis by nathanjhunt September 1, 2011