1. The elastic band of tissue connecting the foreskin of the penis to the underside of the glans; the fraenulum praeputii penis.
2. The string of a banjo, often plucked or strummed in order to produce twangy music as most regularly associated with the Hillbilly or Billy Connolly.
Not quite so hard, Sarah; you'll snap my banjostring!
The thread that joins a males testes with his penis, clearly visible as an apparent line running down both the shaft of a mans penis and his testes.
"Oh My god, last night when i was fucking my girlfriend my banjostring snapped and it bled for hours".