A woman brushing off crumbs accumulated on her shirt around the topside of her breasts. Usually associated with a full-bosomed woman with a nice upper shelf.

Shelf dusting -engaging in said activity.
"I love watching a shelf duster do her business after a little snack. They should make shelf dusting videos!"
"After eating the crusty French bread, Lizzy tidied up her black t-shirt with a quick bit of shelf dusting."
by Darlinka Kevina November 27, 2013

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