Well, some of my UND friends claim UND(hockey) and some of the more "out there" fans on the interwebz seem to think UND has an enormous national fanbase via the hockey team. So....by that logic, those folks....and probably friends of those folks...would have understood the reference.
Honestly, most people probably didn't understand it. Some people may have looked it up...I've done that before for some weirder family guy references that don't click right away for me. It is a bit of fun for the fans of schools who do know...and maybe a bit of a peter-tap(light slap to the male genitalia) for the "Nickname at all cost" folks.