The name given to the slapping sound produced during the act of sexual intercourse in the famed doggy style position when a males testicles, which are especially loose and/or saggy due to heat or over stimulation, smack against the back of the females thigh and produce a slapping sound reminiscent of a soft clap of the hands.
Man 1 "Nigga i was bangin my girl the other nightdoggy style and my balls were so loose that the sound of the thunderclap was proper so loud that i went deaf in my left ear."
Man 2 "Shit nigga you best calm down on swingin dem testiclots around."