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2.
What you do when a girl as hot as fuck walks by.
When the sexy girl walked by, i whistled.
by me@home May 30, 2007
 
1.
slang for a gun.heard mostly in the hbo series "The Wire".
you said we cant have no whistles in here so what the fuck.
by zxulu tha big lip bandit November 15, 2004
 
3.
Another name for a quickly made Crack pipe consisting of a can bent around the leg and cigarette ashes.
T weso hurry up and craft up the whistle!

The boulder is almost done cooking!
by V dux August 28, 2007
 
4.
First entry is completely correct.

But to add some interesting info... The term 'whistle' is used a multitude of times throughout HBO's, 'The Wire'. Although it is never distinguished or addressed directly, it becomes apparent that the term 'whistle' really refers to ONLY a pistol, a semi-matic handgun.

David Simon's bestseller book and basically the father/catalyst of The Wire is 'Homicide'. Again the term 'whistle' is NOT explicitly defined) (Wether its only a pistol, or maybe a type of Mac/Tec or a shotgun) However the book does make it clear that 'whistle' is a term used in Baltimore. This isn't explained out right, but through stories, recorded conversations with citizens and the times when slang was recorded throughout the book, it becomes abundantly clear that the use of the term is authentic, meaning 'whistle' is actively used there.
>> "Yo we movin' out now, make sure you grab yo whistle!"

>>"Yo man, what if someone jumps out on us, rolls up on our corner?" "Nah its straight man. Check it, Got dat whistle layin over there..." (Points at a pistol sitting on top of a tire on a car, semi hidden between the wheel well and the tire, but close to the corner/stash)

>> "Nigga, either sound off wit dat whistle or tuck it, you be obvious as shit right now!"
by OttotheIII February 27, 2013
 
5.
Suit. From Cockney rhyming slang: whistle and flute
Lookit me noo white wissaw and flute!
by flatley June 06, 2005
 
6.
Slang term for cell phone.
Yo B, you got your whistle on you?
by JuneBugSpade February 06, 2014
 
7.
Tampon applicators, sans tampons, known to float in the 'rhea river. Named for their resemblance to whistles or any other wind instrument.
The most common whistles floating in the 'rhea river were pink in color.
by Sastwatch September 24, 2008