A type of "Silent, But Deadly" fart. This subdivision is classified as vomit inducing and nauseating to those who inhale the toxic fumes. A whiff of this deadly gas has the ability to incapacitate someone and render them unconscious. This classification of fart is only used in extreme cases, when the producer of the fart is the only person aware of the release until the smell reaches its victims. The abbreviation of this, IMG can also be used in conversation.

To provoke this type of fart the following conditions may apply:

1. Consuming too many foods w/ high amounts of carbohydrates
Of the three main nutrients, carbohydrates produce the most gas because sugar and starch easily ferment. Half of us are endowed with bacteria that particularly prefer munching on unprocessed carbohydrates -- unless you are like me, in which case tuna does the trick. As you might have guessed, beans contain more indigestible carbohydrates than most foods.

2. Consuming indigestible foods
Many daily foods are considered "indigestible" -- milk being one of them. Cow milk is unnatural to the human body, which is why a lot of people are lactose intolerant. Lactose intolerance means the body does not know how to digest milk, so it sets it aside as waste. If you happen to have a lot of "gas enzymes" in your system and you are lactose intolerant, milk can make you fart.
John: Yo, today in class I totally released a cloud of Incognito Mustard Gas.
Max: No way, dude I was trying to pull that off for the last month.
John: You won't believe it someone actually puked all over their desk, some other kid passed out.
Max: Dawg, that's some tight stuff right there. You gotta tell me your secret.
John: No problem let me just eat this can of beans and this whole onion. Gotta keep up the flatulence if you know what I mean.

Max: I always know what you mean, man. Send me some of that though. I totally need to release some of that IMG soon dude. Been holding it in for like a week.
John: DAWGGG.
Max: DAWWG.
by MEEEGAAN December 10, 2013
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When you put mustard on your penis(or phallic instrument of choice) and have anal intercourse with a partner. Upon completion, the receiving partner will then release any gasses and or residuals over the giving partners face.
Me and the wife wanted to spice things up so we tried the mustard gas bomb last night.
by ThatGuyUBlue December 27, 2016
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You know how asparagus makes your pee smell? Yeah, well when you eat some things... it makes your shit yellow. Look up 'Dirty Sanchez', yo!
Yo, I totally mustard gas sanchez'd Mac-N-Crack while she was passed out last night, yo!
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the chemical reaction of mustard gas and play-doh used to restore the enviroment

it works
i am dropping a dijion mustard gas in 3 2 1
by big Zebop November 12, 2020
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The reeking filthy gas that crawls past rank shit to infect the world with its putrescence. Typically this releases by your drunk friend in a public area to his utter embarrassment.
Sean dropped Mustard Gas on Oscar’s poor wife last night…
by Whoremembers September 3, 2023
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noun
a colorless gas like liquid which is a vapor and a powerful irritant and vesicant, used normally in chemical weapons and was used industrially until the end of world war 2 (1945)how to make it at home? Well all you need is bleach and ammonia (don’t make this at home if you do and get hurt it’s not my fault it’s your dumb ass fault ok) and if you are exposed to such gasses please contact your country’s emergency number. The side affects are coughing up your lungz, suffocating,coughing up blood, and death
“The Germans released mustard gas! Quickly put on your gas mask!”
by Mr.Clean338 March 18, 2021
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