Abbreviation for "not quite ugly." Used in similar notion to fugly and qugly. Generally in reference to the girls/guys who are perfect 5s (out of 10). They're not unattractive, but you wouldn't sleep with them. These people mostly go unnoticed by society - like movie extras in real life.
Eric: I think that girl is pretty cute.
Steve: I don't know, to me she's pretty nuhqugly. You know, she just fades into the background.