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1.
A look of extreme disappointment, disgust, and concern. Frequently acted out by Walter White on the show Breaking Bad
When walter's partner Jessie brings Funions as the only source of food for a 3 day cooking spree, Walter "Walt Faces" as the sight of them.
by ksjerry December 02, 2011
 
2.
A direct insult towards a person who may be acting in a stupid way or is old and from Loch An Iuir Donegal.
"He is acting like such a walt face today"
"Your a waltface" this must be said when the walt face is mid-conversation with you and you must keep a straight face.
by Óran June 27, 2006