One of the most dangerous and wide spread gangs in the U.S., the Crips (a.k.a C's,blues,crabs), was founded on a June 6 by Stanley "Tookie" Williams.
Every June 6th all members of the Crip gang get together and "flag" (a.k.a cause trouble,gangbang, etc). Any person wearing the color red this day (color of their rival gang the Bloods) will most likely get beat up.
Young People (teenagers) influenced by Modern Day pop-culture of Hip-Hop and Gang Culture. The term does not exactly mean you are a "crip", rather indicating you are a modern "gangster".
Todd: "Damn, Haseen is such a Modern Day Crip"
Louis: "I know, look at his cookie monster hat, its so badass"
Real Crip: * Shoots everyone in the crowd *
Modern Day Crip: * Offers a cherry Pie *