The courtesy whistle made when pulling a train to signal that your turn is over and that it is time for the next in line.

When a partner inserts their finger into another partners ass and they proceed to fart around that finger.

The trifecta of sound created when a girl farts, burps, and queefs simultaneously

A whistle that gets all the bitches

When you fart in a girls face after intercourse. That's a Wyoming Train whistle

During a gay rimjob, the receiver farts into the licker’s mouth.

A sexual act in which helium is pumped into the rectum of someone. Once the colon is filled with helium, the "whistler" then sucks the gas out of the sphincter, and procedes to talk in a high pitched voice.

The addition of Cajun seasonings to the asshole causes this act to be known as a "Cajun-Louisiana Train Whistle."