the same as 'nigga' is to 'nigger' nigger is an ignorant person, niggas are tight people, or a legit person. a ginger is a fucking retard who is a firecrotch doosh, commonly wearing glasses and sunscreen thick on the nose, never goes outside aka: a daywalker. gingers get the shit kicked out of them by tight people. 'ginga' is a red-headed tight person who beats the shit out of lesser people, smart humans do not mess with gingas, they are thugs who dont show it from their skin/hair, likely to carry a glock without you ever expecting it, not afraid to kick your ass.
Brian: Haha, look at that ginger, what a firecrotch.
George: nah man, be careful, that dude's a ginga, you can see his piece stickin out, he'll fuckyaup