The type of guy most likely to be seen clubbing at a meatmarket. The name is derived from the type of music generally played at such establishments.
Guy 1: The Nutty Irishman? I don't want to go there just to be surrounded by all the oonce-oonces!
Guy 2: WTF is an oonce-oonce?
Guy 1: Y'know... (flips collar up, sneers) oonce-oonce-oonce-oonce-oonce...
1. Usually misunderstood to be something akin to the African-American version of White Supremacy, Black Nationalism arose as a political movement in the 60s and 70s out of the belief that America as it existed was an essentially hostile environment for African-Americans and as such, African-Americans should resist integration efforts and seek out a separate nation for itself. Black Nationalists stressed pride in their identity and ancestry.
Folks who think Black Nationalists are racist don't understand the term and never experienced the intense hatred experienced by Black Americans in the Deep South.