When a man ejaculates into his partner's mouth without warning and the angry partner attempts to yell in anger, only to produce the war cry of Chewbacca.
When a girl is deepthroating you, you pinch her nipples right as you cum. Her scream paired with the warm liquid and dick in her throat will produce a sound similar to chewbacca's growl
When your getting head and as you jizz you pinch the girls nips and the combination of the warm liquid in her throat and her scream make the Chewbacca noise
While receiving oral sex, thrust your penis down your partner's esophagus when you reach the point of ejaculation. Your partner will try to scream at you for surprising/gagging them. And with your penis ejaculating in their esophagus, it will sound like a growling noise that will resemble Chewbacca from Star Wars.