A whistle sounding like a bird call used by members of the Crips. Like other elements of gang culture, it is popular with non-gang members because it sounds "cool".
In contrast, the Bloods have "brrrrat" and "BLAT", both onomotapoeia of gunshot noises. The Crips also have "clat" or "ccclat", which are also supposed to sound like gunshots.
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.
To annoy, aggravate, or upset. Similar to jerk my chain, grind my gears, or twist my nipple. Refers both to the fact that a damaged whistle will not sound and also to bending the pitch of a whistle's note, i.e. changing one's mood (in this case, for the worse). Some read slight sexual innuendo in it.
"Did Leroy send you another stupid chain email?"
"Man, that guy is really bending my whistle."