Banging the drum softly
Banging the drum softly, or ear-fucking, is the act of penetrative intercourse in or around a man or woman's ear canal using ear wax as a natural lubricant. During the act, the tip of the penis rubs against the eardrum (hence the name), creating an intense pleasurable feeling in the head of the penis for the giver, and a pulsing and/or ringing sound in the ear of the taker.
"Sorry I didn't pick up the phone, mom. Mike was banging the drum softly and I could barely hear anything!"