A special whistle for bringing to a friends house to blow if someone is bullying you it is shaped like a penis and it moans and white stuff comes out of it if you blow it. Used to call help for little Christian boys
a device, usually a vuvuzela, used to warn those within hearing distance that grenades are present in large numbers. Proper use of a grenade whistle can be seen on The Jersey Shore
*fat ugly gang of girls approach*
Mike: Blow the grenade whistle!
kobe whistle happens when the referees are calling unreasonable fouls on defenders who are guarding a superstar basketball player e.g. Kobe, James, McGrady etc.
Rookie to his teammate: I hate when I always get kobe whistled! I get fouled out every game!