1960 (ref. to c.1900) oral testimony in Lighter HDAS I 113/1: ‘You’re getting a regular beanie.’ It’s short for bean belly.at beanbelly, n.2
1972 oral testimony q. in Lighter HDAS I (1994) 310/2: They probably sent those records out to Bumfuck, Egypt.at Bumfuck, Egypt, n.