Gudgeon (noun) (archaic)
A credulous or easily fooled person.
Gudgeon also has many definitions still in use. The pivot on which a bell rotates, the tubular part of a hinge, a pin holding two stone blocks together.
Middle English: from Old French goujon, diminutive of gouge (see gouge).
“Has the old gudgeon never heard of a celebratory glass of champagne?”
Nothingburger (noun) (Chiefly US)
A person or thing of no importance, value, or substance. Now esp.: something which, contrary to expectations, turns out to be insignificant or unremarkable.
1950s: from nothing and burger. Added to the OED October 2018.
Minimal government; specifically a (hypothetical) form of government that does not interfere with individual rights and civil liberties, and that has itself no right to levy taxes upon legitimately acquired property.
1960s; earliest use found in Ralph Borsodi (1888–1977). From min- + -archy.