A type of muffler that is used for shitty cars (mostly rice burners such as toyota and nissan) that makes a very low-pitched hum. Shit whisltes are used to make the cars seem to have a sizable amount of power and/or speed. When rubber meets the road however, the car proves to be a heap of shit.
Dumbass: Dude, that supra sounds awesome! I bet that thing could tear it up on the quarter mile!

Smart person: No, that's just a shit whistle. The car will actually run about a 15 second quarter mile.
by The REAL Moonshine December 18, 2005
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I'm not quite sure of it's origin but the first time I heard it was on active duty with the US Air Force some time in the late 1970s.
A shit whistle is the item used by people, known as shit-whistlers, who tells a complicated and evolving tale that they alone believe. In psychiatry the closest term is a confabulation.
"Hey, you should have been at the NCO club last night! John was blowing the shit whistle again..it was a classic!"
by Uberklokken August 7, 2018
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During sexual intercourse a slide whistle is inserted into the partners anus and defacated in. The whistle is then removed and played by the other partner.
Partner 1: “hey, can you give me an Armenian Shit Whistle?

Partner 2: “sure! I’d be happy to”
by bss120 June 13, 2022
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Diarrhea so bad that the loose stool exiting the anus creates a whistling noise. It should be noted that the noise can range from a low pitched hum all the way to a high pitched scream like a Piccolo Pete firework.
I’m scared to be too far from a toilet ; I’ve got the screaming whistle shits.
by Gargle McBalls. August 24, 2023
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A fart right before you shit
Julia was that a shit whistle? You better go shit now!
by EricJC November 11, 2021
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Def: To exude information that is patently false, misleading, and completely fabricated much in the same manner a Steam Whistle releases steam.

Noun: To be a constant and unabashed source of false information. “That news network is a nothing but a Shit Whistle.”

Verb: To partake in the act of spreading clearly false information under the banner of truth. ex: “There he goes, shit whistling as usual”

Adj: To be associated with the spread of information that is clear fantasy. ex: “What a shit whistling moron that guy is.”
That guy said the sky is made of marshmallows, what a Shit Whistle!
by sleet420 February 13, 2021
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