Commentary generally given from a restaurant table adjacent to a table with one or more fatties regarding their eating habits. Hilarity generally ensues.
Carly: (Under her breath) Watch this guys, those whales over there are about to sit back and nom nom nom
Fatty: (Sits back) Nom nom nom
Fatty: (Sits back) Nom nom nom
by thisisnotmyname8i758756 December 07, 2009
Get the Sit back and nom nom nommug. by The Cottage December 11, 2010
Get the Nom nom nom til she com com commug. 
Delicious. A version of 'yum yum', usually typed not verbalised. Always in connection with cheap cake nobody with any discernment whatsoever would actually ingest, typically containing modest traces of actual cocoa and abusive amounts of artificial additives, and with a shelf-life of decades. Origins: onomatopoeia representing the sound of somebody pigging out in far too public a way. Does not help any conversation. Never use this expression.
by Frou-Frou December 23, 2018
Get the nom nom nommug. 