Two individuals, undefined in orientation and/or
gender, each partaking of one half of a
mans penis, divided lengthwise, by means of oral suction.
After a heated arguement, they decide to
compromise and perform the dueling harmonica.
Guy 1: Yo, these two babes shared my donicker last
night.
Guy. 2: You
mean they gave you a dueling harmonic?
Guy 1: Yeah, I guess.