When you an object(usually a ball or foot) comes into contact with your sac. This creates an internal "bubble" within your balls causing excruciating pain and discomfort. These sac bubbles are common among guys who enjoy kicking each oher in the sac.
When you are suffocating a girl with a clear plastic bag while fucking her, and right before you explode your load (while she is still gagging) you shove your penis inside the bag and blow your load on her face.
Dude, I gave that girl a sac lunch, but she didn't get air in time and the fucking bitch died!!
the act of making a clapping noise with your sac. This can be done when having sex or solo. Solo being the real dick trick when alone swing back in forth to make the sac clap against the gooch.