Aside from being the name of a biblical character, "blastus" is another term designating a type of fart. A very large amount of intestinal gas is expelled at considerable force. As the flattus is violently expelled through the anus, the high amplitude oscillation of the sphincter results in a great, explosive, low tone of frightful volume. The term may also be applied as a proper noun as necessary.
The boys from the hood made a blackusation by saying that Jerome was hired because he talks white and sold out.
Shamiqua made a blackusation when she told Amber "Stick to your own kind and quit trying to "steal" all of the good black men."