Mid 19th century; earliest use found in Charles Darwin (1809–1882), naturalist, geologist, and originator of the theory of natural selection. From nonplus + -er.
Definition of nonplusser in US English:
nonplusser
nounnɒnˈplʌsə
rare
A matter which nonplusses a person.
Origin
Mid 19th century; earliest use found in Charles Darwin (1809–1882), naturalist, geologist, and originator of the theory of natural selection. From nonplus + -er.