crip whistle
a young black male was shot down in the hallways of a high school after he gave a high-pitched whistle which was misheard as a gang call, the crip whistle
"  a whistle sounding like a bird call used by members of the crips
"a young black male was shot down in the hallways of a high school after he gave a high-pitched whistle which was misheard as a gang call, the crip whistle" What is the definition of "crip whistle"?