Definition of first-chop:
(adj) :
Preceding all others of a series or kind; the ordinal of one; earliest.
(adj) :
Most eminent or exalted; most excellent; chief; highest.
(adj) :
Of or belonging to a first family.
(adj) :
Coming right after the zeroth in things that use zero-based numbering.
(adv) :
Before anything else; firstly.
(adv) :
For the first time.