Calvin Coolidge called Herbert Hoover "Wonderboy". Derisively. Because he disdained Hoover's propensity for interfering in everything...especially the economy, which Coolidge, an actual Conservative...disapproved of.
Coolidge said of Hoover:
"That man has offered me unsolicited advice for six years, all of it bad."
I think we have found the perfect sobriquet for the FNG* .
*fucking new guy