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1.
A noise made out of pleasure, usually relating to sex, beauty, or food.

"Nngh" is usually uttered when viewing, hearing, or even tasting something extremely pleasurable.

Made popular on the blogging website Tumblr.com
Laurel: LOOK AT THIS ALBINO SWEDE.
Annabelle: NNGH! He's gorgeous! Look at this soufflé!
Laurel: NNGH! That looks delicious!
by Calvin Scot July 03, 2010