When you are the first, or one of the vanguard, to do something, get into somewhere, or rock a particular style, you let everyone around you know by shouting, "Early!" Cooler than "first!" which is for lame internet people.
*Kid from Harlem breaks down fence at Nas concert and is first of a mob of people top bust inside and see show for free before security come and start beating people down*
Kid from Harlem: Early!
T: Yo, I hear the new G.I. Joe movie is going to be dope son.