Thrumb

To casually excite a lady or gentleman through a garment with your thumb or thumbs

John, why do you always thrumb yourself at your desk?

John walked into the kitchen and to his delight Randall was thrumbing Geraldine by the fridge

thrumbing

The act of rapidy scrolling up and down web pages on an iPhone or iPod Touch using both thumbs simultaneously. When done correctly, it looks as if the two thumbs are little legs running in place.

"I hated scrolling through never-ending blogs on my iPhone since I got a cramp from all the thrumbing I had to do."

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