LATIN DICTIONARYLexicon Latīnum
pronounfirst/second-declension pronoun (nominative masculine singular in -er, pronominal declension) with an indeclinable portion

utercumque

utercumque (feminine utracumque, neuter utrumcumque)
Classical[ʊ.tɛrˈkʊŋ.kʷɛ]Ecclesiastical[u.terˈkum.kʷe]

Meaning

  1. pronouneither, whichever of the two
  2. pronounwhoever of the two

Declension

singular
formmasculinefeminineneuter
nominativein -er
utercumque		utracumqueutrumcumque
genitiveutrī̆uscumqueutrī̆uscumqueutrī̆uscumque
dativeutrīcumqueutrīcumqueutrīcumque
accusativeutrumcumqueutramcumqueutrumcumque
ablativeutrōcumqueutrācumqueutrōcumque
vocativeutercumqueutracumqueutrumcumque
plural
formmasculinefeminineneuter
nominativeutrīcumqueutraecumqueutracumque
genitiveutrōrumcumqueutrārumcumqueutrōrumcumque
dativeutrīscumqueutrīscumqueutrīscumque
accusativeutrōscumqueutrāscumqueutracumque
ablativeutrīscumqueutrīscumqueutrīscumque
vocativeutrīcumqueutraecumqueutracumque

ŭter-cumque (-cunq-), utrăcumque, utrumcumque,
I. pron.
I. Whichever of the two, whichsoever, whichever (rare but class.): magnae utrimque copiae ita paratae ad depugnandum esse dicuntur, ut, utercumque vicerit, non sit mirum futurum, Cic. Fam. 6, 4, 1: in quo bello, non, utracumque pars vicisset, tamen aliqua forma esset futura rei publicae, id. Brut. 1, 15, 10: ea res, utrocumque dicitur modo, Quint. 9, 2, 6: utrumcumque erit, prima sit curarum, ut, etc., id. 4, 2, 89; cf. id. 5, praef. § 3: ne sententia sua, utramcumque in partem dicta esset, ipsa sese rescinderet, Gell. 5, 10, 15.—
II. Indef.: utrocumque modo sequetur summa confusio, either way, Quint. 3, 6, 29; id. 6, praef. § 11; 12, 10, 59.

Origins

Univerbation of uter + -cumque.

Quick answers

What does utercumque mean in Latin?
utercumque, a pronoun, means “either, whichever of the two; whoever of the two”.
How do you pronounce utercumque?
In classical Latin, [ʊ.tɛrˈkʊŋ.kʷɛ]; in ecclesiastical (church) Latin, [u.terˈkum.kʷe].