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1.
Eating food whilst masturbating
A: I heard about edible panties, and man am I hungry and horny.

B: Have you tried snacking off?
by onemanarmy675 November 18, 2011
 
2.
Breaking your health-food diet with junkfood
How did you gain weight? have you been snacking off?
by UrbanDictionaryFan101 November 15, 2010
 
3.
Literally: Enjoying any snack while pleasuring yourself.(masturbating)

Figuratively: enjoying a guilty pleasure type of snack in which you have no way of stopping.
The movie was shorter than we expected so when we came home we caught my roommate snacking off.

As soon as my girlfriend left I snacked off on m & ms.
by Ill will skillz October 26, 2014