The act of inserting a fluffy sticky soft candy into the anus in any amount to be dissolved in the colon before anal sex/
masturbation to purge the lower bowels of all fecal matter. After purged, it can be done again to fill the colon with a clear sticky fluid for the enjoyment of others.
Marshmallows are a powerful laxative.
Marshmallow stuffing should not be done by diabetics or anyone else concerned with blood sugar. Should be done in moderation to avoid pooping yourself at work.