hummer with foil

A specific form of fellatio in which aluminum foil is cupped around the testicles. As fellatio is performed, the giver "hums" (melody optional) such that the high frequency of the sound waves causes the foil to vibrate, creating a stimulating sensation.

Guy 1: Dude, that girl's so hot.
Guy 2: Totally. She really should be giving me a hummer with foil right now.

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