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(Verb.) An act of stashing food or crumbs in your mustache, whether it is conscious or not.
*Heinrich Himmler and Adolf Hitler is enjoying a fine meal*

-Adolf Hitler: This is good food, ja?
-Heinrich Himmler: Ja, you have some crumbs in your mustache.
-Adolf Hitler: I am mustashing it for later, sie verdammter Idiot!!!

*Ned and Todd Flanders enjoying a meal*

-Todd: Dad, you have something in your mustache.
-Ned: Oh, I'm diddily saving it for later, son! It's called mustashing.
by Mr_Wagner March 12, 2012