The actual term was coined in the mid-1960s by the late Robert H. deCoy where he postulated:
"NEG-RO... A white Nigger. Or a brainwashed Black who would be a Caucasian if possible. "THE NEGRO"... To be consciously "Negro" is to be nothing but a "State of Mind," constantly in turmoil and conflict with your natural "State of Being," Blackness. "Negro" is but the outgrowth of a contagious Mental Anemia, which ravishes the brain of our Black-kind. Scientists have adopted my name for it: "Psy-cho-neg-ro-sis." A nervous disorder of mental origin, resulting from anxiety, frustration, and failure to become transformed from Black people into white." ("THE NIGGER BIBLE," Robert H. deCoy (Copyright 1967) Pages 33, and 169).
However, with our greater understanding of the disorder, we were forced to revise Robert H. deCoys definition.

EXAMPLE 1:
Blacks/Africans WORSHIP other peoples gods, wear other peoples clothes, chase other peoples women, speak other peoples languages, and even place more value on non-Black life than on Black life by engaging in the killing of Black people but thoroughly refraining from even offending the sensibilities of other peoples; such is the outgrowth of pshchonegrosis.

EXAMPLE 2:
Blacks/Africans fight assiduously for policies and interests (Abortion, the Homosexual-Agenda, Interracial-relationships, Feminism, etc.) which will clearly bring about their own undoing; such are the outgrowths of psychonegrosis.