noun
or sock·dol·o·ger also soc·dol·a·ger säkˈdäləjə(r)
( -s )
Etymology: perhaps alteration (influenced by sock ) (V) of doxology
1. : something that ends or settles a matter : a decisive blow or answer : finisher
2. : something or someone outstanding or exceptional
a blizzard — a real sockdolager — Lorna Slocombe