when your balls are hung low and sway side to side with ease

The horrible moment when you realise that you have accidentally done something very slightly wrong which has very bad (usually embarassing) implications for you. This is typically the moment of realisation that you just sent a dirty text message to a close member of family, typically your mother, rather than the intended recipient.

Unusually large glans on a penis.

When you take a shit that is so long that as it falls from your ass, it leans forward and bumps into the back side of your balls like clanging a bell.

to flick ones balls. testicles if u will.

When you're fucking a bitch and your nuts clap against her anus making a sound

The swinging action big tits make when a chick is getting it doggy.