A variation of giving someone "the finger", where the middle digit is fully extended and the remaining fingers are bent at the middle knuckle.
An advanced maneuver, the extra manual dexterity required is meant to indicate extreme displeasure with the party on the receiving end of the gesture. Also, it's fun to watch people who can't do it struggle like retards trying.
Yo G, let me put down the rag top so I can flip this bitch in the Escalade the bird. You need to come correct if you wanna merge in front of the 5 point 0. Can't a nigga get a turn signal?