Well, I haven't heard it by Belge people, but I heard it the way
Dutch people said it.  So, here's my way of telling you how to
pronounce it.  If someone knows better, that's fine, too.  :-)

Here we go:  Separate it into two words, "hoog" and "huys", and
replace them by two words you know.  The best fitting for the
pronunciation I found are "hog" and "Heuss" (do you know the
pronunciation of Theodor Heuss?!?)

Now speak it without making two words out of it, but also without
a too big a break in it:  "hog-Heuss"  (Nooo... Theodor Heuss was
no hog...  ,))

Hope this helps,

greetings by(e) InK -- Ingmar Krause
ERlanger drehORGEL-Trio, Familie Krause, erorgelt@erlangen.franken.de