A modest toot of ass gas presaging a tuba blast, possibly heralding a morning fart.
I just let loose a warning fart,
To warn you of my morning fart,
It will not be a boring fart,
For all night I've been storing fart.
by Brjtlc April 27, 2010
A fart that precedes a bowel movement. It smells horrible and gives you a clue that a stinky turd is soon to follow.
One guy: "Aww jeez, who stunk up the room?!".

The other guy: "Uh oh, I think that was a WARNING FART", with a look of panic on his face as he runs off to the can to take a massive dump.
by Low Class Loser July 10, 2008

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