Lyric discussion by TozieD 

Cover art for Run Run Run lyrics by Velvet Underground, The

"Teenage Mary, said to uncle dave/Sold my soul, must be saved"

The virgin mary was a teenager when she found out she would have jesus as a son. Uncle Dave could be King David, who was connected to the birth of Jesus (not sure how). Introduces the song with some sort of biblical religious reference (regardless of the meaning has been influential in songwriters like black francis).