Someone who is blessed with an exceptionally large penis. Following the common preconception that black men have large penis', this would refer to the penis being the one eighth of a person that is of black ancestry.
If you want to know why we call Blake octaroon, you'll have to ask him to show you.
by Manuel Tendo March 19, 2008
Someone who is 1/8 black.
That girl looks real exotic, is she spanish Maybe she's an octaroon.
by fatassmuffinman February 15, 2003