City Spud is a part of the St. Lunatics, a group that included Nelly.
Per The Riverfront Times, he was often mistaken for Nelly’s brother, and his name was explained by Ali (another member of the St. Lunatics) as follows:
We called him City Spud for the fact that he was -- it was like calling a fat person Tiny. He was from the county. He was always from the county, real passive, real nice, real neat, just a really cool guy. He was so county that we called him City.
City Spud's first song Ride Wit Me released on Thu Jan 01 1970.