Originating in Philadelphia in the winter of 1993. Olney High School student pronounced "yo" like so while screaming across the lunchroom to friend. Following summer, everybody in Philly says "yerO" as an alternative to "yo".
And dying in yo' bed many years from now, would ya be willing ta trade all da days from dis here day ta dat fo' one chance, just one chance, ta come back here as young men an' tell our enemies dat dey may take our lives but dey will never take our freedom ... YUB NUB!