(sok-DOL-uh-jer) - n., a decisive blow or comment, finisher; an outstanding person or thing, esp. in heaviness.
Over in my main journal, the theme of the week is colorful 19th century American coinages
, most of them first appearing in newspapers in the 1820s and '30s -- a wildly fertile time for linguistic invention. In this case, it was coined around 1830 from sock, to hit hard + (possibly) doxology, in the Puritan sense of the closing hymn of a church service, taken in its extended meaning of a finisher. So, the original sense is of a knockout punch. To give an example of the extended meaning of something outstanding:
“There is but one ‘sogdollager’ in the universe, and that is in Lake Oswego”
—James Fenimore Cooper, in Home as Found (1838)