Knockin'

Could someone tell me the origin of [word removed in order to comply with Google's Publisher Policy] knocking, or of the [word removed in order to comply with Google's Publisher Policy] chaser> thank you

The now considered offensive [word removed in order to comply with Google's Publisher Policy] is a variation of negro (which some people also find offensive), which means black. [word removed in order to comply with Google's Publisher Policy] knocking is just alliteration.

[word removed in order to comply with Google's Publisher Policy]-knocking is when people in a vehicle stick a board out the window and knock down a black person who is walking along the road. I learned that phrase while reading a biography of Janis Joplin, who grew up in Texas. I guess [word removed in order to comply with Google's Publisher Policy] chasing would be along the same lines. Isn't that god-awful.

Typical Texan behaviour - look at GW's plans for the Middle East.